This mosaic was made from 2500 individual photographs of circles, photographed by 542 talented individuals. The mosaic was constructed algorithmically by Jim Bumgardner using images from the Squared Circle photo pool at Flickr, the photo-blogging website. Each individual tile in the mosaic is a unique photograph of a different circular object. Here's a closer view of the mosaic. Click on a tile to see the original photo. Thanks to Andrew Wallace for helping with the map!

This poster is being sold at cost. You can order one (for $4) at www.krazydad.com/posters/

Here are the creators of the individual tiles on the poster:

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

1541:
  1892433, 5112584

1of@kind:
  3051964, 3066150, 3066151, 3066153, 3067433, 3876328, 4601456, 4620171

A

a nameless yeast:
  2354416, 2637786, 3111927, 5571123

A30_Tsitika:
  1119008, 1119013, 1119028, 1138350, 6056841, 6225307

actionhero:
  1097868

Adrasteia9:
  4171691, 4171694, 4171699, 4171705, 4171710, 4171719, 4171720, 4180974, 4180982, 4277358, 4277359, 4277364, 4445252, 4445257, 4445263, 4471512, 4534403, 4632767, 4634016, 4634030, 4634979, 4697800, 4701176, 4702034, 4986472, 5489663, 6138460, 6146243, 6146250, 6557519, 6639078, 6788899, 7059945, 7078644, 7078672

Afroswede:
  1099585, 4160972

aileron:
  1134670, 1134671, 1134686, 2357394, 6942221

Alaina B.:
  1099725, 1594174

alde:
  5578007, 5584357, 5584358, 5743441, 5910003, 6690457, 6821787, 7004244

aleksandar:
  4293823, 4293824, 4598396, 4831923

Alexander Becker:
  6271414, 6454183, 7157297, 7477612

alfarman:
  3778187

alisdair:
  1094219

Ambitious Wench:
  5297126

andersenKT:
  7035140

Andyrob:
  2948419

-Ant-:
  3469222, 3469223, 3469226, 4873368

aqui-ali:
  7104271

ark:
  1120647, 1120685, 1123933, 1123938

Arlette:
  1362355, 1393841, 1393842, 1393845, 1430928, 3257521, 3299309

armrig:
  7114310

Art Ascii (Paul):
  3237327, 3237440, 3238524, 3681361, 6836478, 6895584

artpost:
  4262831, 4262832, 4474169, 4474170

ashitaka:
  1651903

aslakr:
  3742851, 4044805, 5577744, 7020232

atanas:
  5759862, 5973311

Atsi:
  4559944, 4561455, 4562016, 4780353, 4780358

Auntie P:
  1353341, 1353352, 1353378, 1353405, 1353431, 2093087, 2293339, 2419636, 3161287, 3162745, 3162747, 3162812, 3756452, 3990682, 4381713, 4538525, 4538655, 4538704, 4538713, 4539140, 4539172, 4539193, 4541889, 4631800

auntikhaki:
  3580712, 3582493, 3650533, 4184696, 4184747, 4184780, 4641752

B

basykes:
  7147316, 7147318, 7148982, 7150450

Batgerl:
  5555668, 5556266

Bawdy Nan:
  4574491, 4627412

Beej Jorgensen:
  1628601

Belsner:
  5973369, 7053039

Ben McLeod:
  3100919, 3438736, 3759630, 3923165, 3923166, 3929695, 5380593, 7349736

BenSway:
  6805358

BigBlue:
  1100893, 1100894, 1638465, 4807493, 4807495

bikeracer:
  6504523, 6649681, 6688526, 6741144, 6884661, 6884662

biketrouble:
  4018616, 4241228, 4375020

bill barkle:
  4455084

Bingo Little:
  3503700, 3503810, 3621427, 3766056, 3766296, 3766440, 5895475

Bistrosavage:
  3035067

Björn Carlsson:
  6955460, 6955480, 6955588, 6955615

blakefacey:
  3890796

Blueskygirl:
  4354786, 6254014, 6259029, 6351708

bmann:
  6173926

bmb:
  5449077, 5642501, 5790475

boriskeller:
  2834376

Botchandango:
  1298170, 1326997

Brettl:
  7047186, 7047187, 7047189, 7047190

brevity:
  6232426

brianjmoore:
  7438675

Briareos_70:
  7693426

bsantos:
  4962362, 4962363, 5846262, 5846263

bunchofpants:
  1328382, 1415427, 1767621, 7068162, 7690463

buriednexttoyou:
  4315560, 4315563, 4315564

byrdiegyrl:
  3671280, 3673654, 3674340, 3704251, 3735249, 3736606, 3736886, 3858636, 3890310, 3928906, 4168452, 4168457, 4383552, 4706603, 4759947

C

cafenut:
  6154714

cat\'s_101:
  5940512

caterina:
  1085176

catsper:
  3537008

cavepaint:
  3090107

ccgd:
  4345109, 4345112, 4345116, 4660876, 6438955

cer!se:
  5288484, 5288488, 5288498, 5288511, 5288559, 6802925

Chaplin\'sgirl:
  4706395

chelseagirl:
  1035463, 3166120

chidorian:
  2602540, 2602779, 2650093, 2688346, 2951957, 3065658, 3103968, 3519419, 4795357, 5358475, 7666248, 7666597, 7666930

chocolate Fudje:
  4251898, 4295463, 4474489, 4474566, 4476249

Chris Campbell:
  2237738, 2237908, 2238303, 4690077, 4974927, 5462201, 6002391, 6634163

ChrisJ:
  3062306, 7000859

ckindel:
  7528676, 7530761

ClaudiusMaximus:
  2321100, 3848823, 3848826

cleverswine:
  4488633

CloCkWeRX:
  2010167

cmiked:
  2605856, 2906851, 2906859, 4762679

code poet:
  6845315, 7587265, 7587346, 7587361

codini:
  4769213, 4769333, 4769902, 4770940, 4770984

cogdogblog:
  5120301

Collin Grady:
  4948078, 4948086

coolmel:
  4714941, 5281269

courtneyp:
  1825394, 4826344, 5231813, 5653998, 5860599, 6174547, 6646947, 6712170, 7539643, 7542446

cudmore:
  4594449, 4923170, 4987043, 5225473

curiouskiwi:
  1530432, 1542569, 1895495, 2389940, 2951604, 3005395, 3801623, 4477524, 4484489, 4589942, 6877155, 7614230

cyberdespacio:
  5657486, 5680642, 5681611, 5681642

Cyron:
  3731978, 3732048, 3732112, 3732163, 3733953, 3937371, 5569760, 6989144, 7662648

D

d squared:
  4011475, 4012534, 4426298, 5676049

D\':
  3442624

d.a.m.:
  7320081

damclean:
  3564549, 3898549, 4188797

dan winckler:
  6338022, 6339981

davesag:
  5808620, 6588750, 7546300

David Ascher:
  3741357, 5343813

david.orban:
  4785437, 5354374

Dawn Endico:
  1095279, 1095404, 1095732, 1153776, 1319044, 1963444

Daydream Aversion:
  5536212

dcfox:
  1229453, 1333375, 1513506, 2454679, 2501483, 5969686, 6151051

deb5376:
  6192209, 6198010, 6555612, 6594141, 7440164

deepwarren:
  3376576, 3749244, 4143385, 4280836

Defragged:
  1105456, 1107731, 1326741

dek:
  1742600, 1742602, 1742606, 1742607

denn:
  3408321, 3637696, 3697077, 4516834, 4516838, 5240478, 5449747

dennis:
  5367625, 5787584, 6052612, 6175008

Devar:
  3637386

devehf:
  6347744, 6347748, 6347756

deVos:
  1104971, 1105364, 1105516

ditto:
  3382008, 3666061, 3666085

djfoobarmatt:
  4983790, 4983800, 4983815, 4983836

dmythos:
  6402132, 6402551, 7529125, 7529128

doc_anton:
  7030651

docman:
  3141526, 4518712, 5246857

DogFromSPACE:
  4014839, 4014847, 4014853, 4014879, 4014918, 4014921, 4085173, 4085232, 4085264, 4085271, 4085285, 4128246, 4187404, 4187409, 4187421, 4189152, 4189174, 4426406, 4536755, 4575885, 4623780, 4623791, 4623864, 4623876, 4758148, 4758187, 4758218, 4759449, 4827610, 5035311, 6637733, 7088046, 7328080, 7328106, 7328202, 7328220, 7328311, 7328339, 7328348, 7328353, 7342500

dominocat:
  7202569, 7375722, 7489709, 7541231

donut2D:
  5365834, 5963189, 6165317

dopiaza:
  6837843, 6837844, 6841671, 6841708

dotpolka:
  3920443, 3920451, 3920454, 3920455, 3959951, 3975937, 4362568, 4437598, 4437617, 4537064, 4537080, 4537085, 4537095, 4758620, 5255492, 5255512, 5708134, 6378360, 7535697, 7535978

Douglass Turner:
  4299758, 4460285

dps:
  1097023

Drift Words:
  1098142, 1098291, 1098293, 1488932, 1593747, 2495730, 2495739

drlynch:
  1886447, 2031189, 2451159, 2461552, 3663018, 3838882, 5938933

Drpoulette:
  1124444, 1124447, 1124451

duncan:
  3805934, 3805937, 3805982, 5132713, 5132735, 5132744, 7138500

dutchb0y:
  5311686, 5339331, 5828204, 5828227

DWinton:
  3693912, 3767702, 3903578, 3903579, 4247154, 4247426, 4247510, 5696410, 7110635

dwstucke:
  4666537, 4675825, 4677066, 5558326, 6045801, 6341360

E

Editor B:
  5146159, 5932903

eecue:
  3776544, 3776545, 5660605, 5660606

einszwodrei:
  6711007, 6711035

electricinca:
  1469776, 1469777, 5176581, 5176854

elfintech:
  1117695, 1117962, 1118590, 1135076, 1146710, 1150573, 1207866, 1245316, 1245365, 1269138, 1418012, 1418026, 1431635, 1449922, 1546700, 2141140, 2601258, 2601260, 4381520, 4381570, 4381668, 4381786, 4381794, 5181140, 7610104, 7610127

elkit:
  6987683, 6987684

ellipse:
  6885361, 6885373, 6885607, 6885999, 7199309

erin malone:
  3736221, 4962614, 4962622

emdot:
  1232800, 1232801, 1232802, 1331600, 4371273, 7188771, 7189806

Emily:
  1140000, 1513136, 1513184, 1513185

Emily B. Romanczyk & Jeffrey A. Bleam:
  5136865, 5215657, 6058206, 7717926

eshm:
  4640962, 4640964, 7654716, 7660431

espressojunkie:
  1119030, 1119031, 1359200, 1359201

evenwu:
  1194821, 1194822, 2071202, 2071213, 2071215

F

F o u t u g r a p h e:
  1531313, 1531325, 5342128, 5342155, 5342177

fallsroad:
  3935115, 3935118, 3935127, 3935174, 5320717, 5320995

Fant:
  3764020, 3764021, 3764022, 3771998, 3800255, 3838105, 3838106, 3838107, 3838108, 3877575, 3957471, 3999486, 4215672, 4265793, 4265798, 4809899, 4810259, 4810260, 4810261, 5430250, 6324300, 7264970, 7264971

fazen:
  3649016, 3778387, 4836686, 4836691

fczuardi:
  1096685, 1096687, 1102821, 1102899, 1104000

Felix the Cat:
  3462731, 3462826, 3462888, 3481457, 3548885, 7062202

FFgoatee:
  4111606, 4618022, 5395504, 5646725

Fifi LePew:
  1727036, 1727038, 1785884, 3120068, 7685606, 7685792

fiorellino:
  3661283, 3661295, 4155372

Fire Monkey Fish:
  4131728, 6100659

flamingbear:
  4264800, 4264802, 4356030, 4909897

flannelmouthed:
  5086064, 6990886

Fly Lice:
  4656443

fo.ol:
  4194445, 4721335, 7204157, 7355522

fotogail:
  3678197

framboise:
  5551323, 6145953

Frayed:
  4693352, 4693558, 5099766, 5990563, 5990780

fromform:
  4021089, 4021100, 7267822, 7267847, 7296393

Fuzzy Gerdes:
  6210160, 6294749, 6846537

fxwhiz:
  4831962

G

Garrettc:
  6007334

Genista:
  3242797, 3253134, 3277530, 3277533, 3322349, 3357405, 3397240, 3444349, 3470199, 3957930, 3957944, 3957946, 3957953, 3957954, 3957956, 3957960, 3957961, 3957965, 3957966, 3957973, 3957983, 4056001, 4140440, 4140460, 4140485, 4140495, 4140498, 4140502, 4211256, 4211271, 4211273, 4211277, 5447564, 5507470, 5687209, 6384778, 6787720, 7280712, 7280772, 7280789

gianita:
  2207719, 2234019, 2314363, 2434378, 2496113, 3071766, 4516298

Giant Ginkgo:
  4632956, 5720019

gierszewski:
  3912956

gilberts:
  2350934, 3146578

Gini.:
  1117794, 1291233, 1292339, 1292340, 1692060, 6754282, 6979170

Glutnix:
  4714319, 4829448, 4829463, 5168073, 5912930

GoldenEel:
  2679119, 2798670, 7134331, 7135486, 7137281

Gordon Robertson:
  4754093, 4852748, 4865302, 5705274

grange85:
  3925839, 3925848, 5101415, 5101418

GregMeeks:
  4227843, 4232077, 4695514, 4762437

gregw:
  2384585, 5320024, 7074110

guigui:
  4514447, 4514448, 5069439, 5069568

gwENvision:
  1206174, 1315965, 2244296, 2327838, 2776598, 5159940, 5159943

H

Hanni:
  1326663, 1366196, 1372452, 1612826, 1651145

hardboiled:
  3967863, 3988030, 3988238, 3988326

HeatherW:
  3379265

hendriko:
  5103219, 6060913, 6410417

Henry Slater:
  6022713, 6022715

Hey Paul:
  1894143, 2177427, 2288189, 2503086

heyrog:
  5259999, 5281827, 7451681, 7451682

hodge:
  2664112, 4622720

holgalomaniac:
  4235238, 4314123, 5055913

hot_tea:
  2684714, 3249912, 3348052

hufse:
  6686515

Hugo VT:
  3389337

hummanna:
  2491325, 2491334, 3927402, 3927426

humming:
  4275161

hundrednorth:
  3827111, 4506965, 4821461, 4894314

I

iandoh:
  5226477, 5390921, 6029918, 7144135

IanL:
  1783962, 1783963, 2030418, 2030422, 4143096, 4143108

ianus:
  1125400

iceemaster:
  5726387, 5727088, 5727653, 5762350, 7135684

Igpajo:
  1100381, 5401555

Infinite Jeff:
  6659380, 6659381, 6659382, 6714447, 6714566

io2:
  5891909, 6594212

ixab.001:
  6768469

J

j.l.b.:
  3153052

jabru:
  4339235, 4549490, 4729437

jacqueline-w:
  1264075, 1264085, 5918635, 6388230

Jakes_World:
  4465476

James_C:
  6904234, 6904302, 6904350

jan_krutisch:
  1104142, 1104148, 1674904, 1674909, 4354720, 4354729

janerc:
  4585507, 4740422, 4782241, 7056925, 7411459, 7411767

jasonaut:
  2198874, 2207870, 4626673, 4663598

jbum:
  3636912, 3636913, 3636914, 3757335, 4491573, 4491603, 4491609, 5335629, 5555559, 5938071, 5978829, 6745697, 7523517, 7523581

jcroft:
  4551691

jeco:
  1414747, 1523420, 2171510, 2212624, 3935108, 3935305, 3935364

Jenguin:
  3968088, 4133658, 4151526, 4151712, 4443486, 6644321

jermudgeon:
  2834110

jessamyn:
  1473283, 4512971

jessamynnorth:
  1108525, 1108716, 1163806, 2026152

jgoldmania:
  5075317

jhausladen1985:
  2287300, 2393055, 2751219

jhritz:
  2042396, 2479539, 5150729, 5150755, 5764008, 6008359

jibbajabba:
  4043299, 4952863, 6202236, 6531745

Joe Nixon:
  2721976, 4480718, 4481226

jokir:
  1095729, 1095730

jono dot com:
  1171706, 1171741, 1290072, 1477055

jorgempf:
  6520809, 6523271, 6643501, 6697504, 6698813

Joshb60796:
  3725455

José Cuerva:
  2109976, 2551227, 2871339, 2877874, 2879415, 3196125, 3196356, 3459434, 4507751, 4859769, 5454570

jovike:
  1681684, 1681777, 2583642, 3041325, 3275470, 3275887, 3275915, 4355173, 4433465, 4874231, 5403554, 5705070, 6200672, 7562675, 7562780

K

k1rsty:
  3576097, 3608691, 3608693, 4042313

kastner:
  5029607, 5029895, 5029899, 5534761, 6091253

~kate~:
  2667328

kdserack:
  4268640

Kenkun:
  4072323

kennyferguson:
  5270713, 5966445

kenyee:
  1316299, 1316300, 1683602, 1824546, 1824555

Kika BR:
  3548256, 3548257, 3549432, 3897261, 3897262, 3911854, 4054438, 4054447, 4202595, 4202600, 4203016, 4318301, 4352040, 4352043, 4414338, 5810508, 5810522

killbyte:
  2526074, 2728030, 2729033, 2742492, 3481365, 3959735, 4280558, 5259914, 7017170

kk+:
  4444559, 4444608, 4444958

knautia:
  3381026, 3381670, 3391721, 3391722, 3466234, 3551461, 3551464, 4001326, 4004845, 4429058, 4586720, 4588480, 4589225, 4589949, 4590155, 5937435, 7601779

kopernikus:
  4529078

Kryten:
  6904672, 6904673

kucharo:
  3130632, 3730081, 4395280, 5058284

kumquatgirl:
  5260312, 5968621

L

*L:
  4402966, 4680172, 5515172, 6380137, 6672657, 6784089

lacarita:
  3424750, 3624751, 3624752, 6877701, 7018634

lachie:
  3925155

Lathyrus:
  1414008, 1598680, 1598833, 1960767, 1960851, 4383142, 5278500

LemonGod:
  3437960, 3437985, 3549809, 3555656, 4658016, 5253986, 6810840

Lemoox:
  5235580, 5235582, 5299173, 5675143, 6787014, 6837367

LenGen:
  4787954, 5246061, 6207290

Lenny Montana:
  1107818, 1107822, 1107823, 1196608, 3703771

Leo L30:
  5209537, 5233661, 5238355, 5252273, 5291859, 5302639, 5363262, 5363295, 5439977, 5516938, 5516991, 5760660, 5760837, 5760979, 5812853, 5998902, 6204742, 6204856, 6208698, 6208710, 6217875, 6224981, 6338027, 6922509, 6922565, 6925436, 6925685, 6925937, 6935561, 7000081, 7262585, 7426809, 7427110, 7427496, 7427637, 7429656, 7497272, 7497282

lifeinpixels:
  5854950, 5854979

lifelive:
  4540451, 5359361, 5359578, 5359600, 5359734

lightsoutfilms:
  4705865, 6815844

lilitu93:
  1130031, 1130061

limonada:
  2714895, 2781402, 2781410, 2781411, 5362886, 5362910, 7083800

LindaH:
  2945322, 2945326, 2945329, 3199740

lindylu:
  5366968, 5366969, 6006024, 7359042, 7359043

llauren:
  5635532, 6770497, 6999758, 7000971, 7646706

lorentey:
  6268327, 6453978

loser:
  6850317, 6850322, 6850339, 6850343

Losttrekker:
  5131179

Luke Robinson:
  4964108

lunaryuna:
  1121455, 1121744, 1121956, 1122179, 1282917, 1369032, 1369127, 1369344, 1369680, 1369705, 1389112, 1391784, 1392026, 1400658, 1427631, 1473745, 1474052, 1474672, 1476188, 1476189, 1476192, 1492089, 1510481, 1510556, 1549960, 1550268, 1550273, 1568025, 1579125, 1630764, 1630766, 1630767, 1892780, 1965802, 1966615, 1967213, 2022011, 2036828, 2176511, 2176515, 2176517, 2176521, 2176682, 2200079, 2250541, 2277817, 2364003, 2364030, 2398840, 2408913, 2430927, 2465807, 2976374, 3016984, 3017351, 3267539, 3508797, 3539046, 3602553, 3717631, 3747466, 3826148, 3960933, 3982729, 3982731, 3982732, 4219501, 4399739, 4606346, 4606350, 4606553, 4607015, 4607080, 4615509, 4742362, 4944878, 5167958, 5178919, 5285688, 5311794, 5426980, 6073351, 6247484, 6250771, 7496395, 7496396, 7713190, 7713943

.lou:
  1098004, 1098008, 5182440, 6455813, 7445214

Luodanli:
  7600704

LynGi:
  5869857

M

mac steve:
  1095803, 1095807, 1095813, 1095823, 1096649, 1096659

macaddict:
  3408106

macfixer:
  6454364, 6454924, 6537455

machete:
  1133045, 1133050, 1133054, 1153080, 1153161, 1347380, 1347755, 5313759

Major Clanger:
  1144407, 1148554, 1148558, 1296216, 3820099, 6445015, 7616270, 7625077

mamamusings:
  1167829, 1167832, 1167841, 1167845

Mangrenade:
  4118417, 4118433, 4118478, 4562209

ManHole.ca:
  5760421, 5840053, 6820899, 7444231, 7444232

mariusm:
  5038817

Martin Burns:
  6015985, 6155651

masck:
  4750259, 4750264, 4750273

Master Toad:
  6238394

Mataparda:
  5198069, 5198070, 6438104, 6438107, 6438108

matizi:
  3504603, 3541119, 3549950, 3920897, 4164341, 5411955, 6203917, 6285653, 6311044

matt.ohara:
  2352715, 2352720, 2429402, 3277750, 3402446, 5909389, 5909399, 6695936, 6695947

MattL:
  1063208, 1063212, 1080685, 1080688, 1133755, 1133756, 1133757

Max xx:
  5297469