persistence on technabob...

This amazing wall clock can display intricate animations thanks to the optical phenomenon known as persistence of vision (POV). Using a small spinning “blade” covered in red, green and blue LEDs, along with sophisticated microcontroller circuit, this clock can dynamically change its look with just the push of a button…

Here’s a cool gadget that lets you send messages using the wheels of your bicycle. By using an optical illusion called persistence of vision, your words are revealed as you pedal your bike.

The Lampex Lex module screws onto the spokes of your bicycle, and produces rapidly flashing sequences of LEDs to display your messages…

By rapidly spinning a blade that contains an array of flashing LEDs, this wall clock tells time in a visually striking way.

A thin LED arm, loaded with 33 LEDs spins at 30 revolutions per second to create the illusion of a complete image. When the blade is spinning at full speed, it tricks your eyes into thinking there are nearly 8000 LEDs…