I don't remember the name of this optical device

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The discussion revolves around an optical device made of mirrors that inverts light and disrupts depth perception. The original poster, Giulio, is seeking help to identify this device after losing track of related YouTube videos and a website. A participant suggests that the device may consist of two periscopes. The conversation highlights the challenge of recalling specific names and resources related to optical devices. Ultimately, the focus remains on identifying the device and its functionality.
giuliopepe
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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
 
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I don't know what the name of the whole unit is but it is two periscopes.
 
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