Here’s a new coverpop featuring the works of my favorite sf author of his generation, Philip K. Dick. The covers were provided by the Philip K. Dick cover gallery, courtesy of Jason Koornick.

Ed Pegg Jr, of the excellent MathPuzzle.com, has put up a complete set of scans of a profusely illustrated classic from 1914 containing 5000 unique puzzles.
Sam Loyd’s Cyclopedia of Puzzles.
If the name Sam Loyd isn’t familiar to you, perhaps it should be. Loyd was the inventor of the sliding 15-tile puzzle. Here’s [...]

I’ve been examining the visual patterns produced by the Whitney Music Box (see previous post). If you watch the animation for any length of time, you’ll notice that the dots form spoked or starfish-like patterns periodically. These patterns often cause chords to be played by the music box.
I was curious to understand the [...]