Pseudoscope
![Charles Wheatstone's prismatic pseudoscope. It switched the images presented to each eye to distort depth perception.](/Images/godic/202502/05/Pseudoscope_prism0345.png")
![Pseudoscopic binocular microscope design by Father Cherubin d'Orleans, 1677](/Images/godic/202502/05/Cherubin_pseudoscope_microscope0345.png")
A pseudoscope is a binocular optical instrument that reverses depth perception. It is used to study human stereoscopic perception. Objects viewed through it appear inside out, for example: a box on a floor would appear as a box shaped hole in the floor.