I don't remember the name of this optical device

[giuliopepe]

Hi,
time ago I found some Youtube videos and a website about this kind of device made of mirrors that invert the light coming from an object, and the effect (even if I don't remember precisely) should be to disrupt the sense of depth. This is a quickly made illustration of this device:

http://img36.imageshack.us/img36/2927/opticaldevice.jpg

I decided to build it, but I cannot find anymore the videos and the website, since I forgot its name!

Could someone help me to find its name?

Cheers,
Giulio

 

[Dadface]

I don't know what the name of the whole unit is but it is two periscopes.