See watch specifications and more images for the Radian watch

Is Tau your favorite constant? Bid on the Tau Circle Watch here

"The Radian Watch combines the unit circle with the 12 hour dial. I hope you already know how to tell time, so we stuck 0 at the 3 o'clock position like it belongs and the radians count up counter clockwise [though the watch hands move clockwise, obviously]. I called out the angle measurements at each of the hour positions and stuck the eighths in there too. In the background is the subtle Archimedean spiral, because it looks cool and graphs the equation r = a + bθ." — Christopher Thompson, designer