This single-prism optical inversion device will show you the world upside down!
Like a camera lens, light entering our eyes produces an inverted image on the viewer's retina. The fact that we see the world the right way up is the result of adaptation using the brain's processing capacity to flip the image.
The effect of looking through
2.0
1 rating
5
4
3
2
1
flimsy
Not worth the elevated cost - falls apart - have had to use sellotape - no better than the cheaper plastic versions available