The original Cylons are from TV's Battlestar Galactica.
They are humanoid robots with a scanning red visor where their eyes should be.

This is a tinyCylon because it's, well, tiny and because it is based on Atmel's ATtiny family of microcontrollers. My tinyCylon is a small, electronic device which simulates the red scanner.
Add some chrome and you're halfway there!
 

Where some people look at my little invention and see a Cylon, other people see KITT's scanner from TV's Knight Rider.
I guess a lot depends on how old you were when these TV shows were first aired.

 

Documents:

• Assembly Instructions
• Schematic
• Source Code