Aspiral Clock found here. & a half day, the clock itself rotates while the ball starts on the outside and gradually runs along the spiral until it reaches the centre and drops down the hole, back to the start—a cycle that takes exactly twelve hours.
A real life Eyedropper tool! This is awesome. A pen with a little censor that scans the color of the object you point it at, then you can write in ink that exact color, it's like the eyedropper tool in photoshop outside of the computer.