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Some experimental psychologists, knowing that the eyes form an inverted
real image on the retina and that the mind then inverts the image so that
we see things upright, fitted human subjects with an optical system that
added another inversion, so that the real image on the retina was
upright. The mind at first continued to invert the image, so the subjects
perceived what they saw as upside-down.
Then, after a period of time (how long?), the mind stopped its inversion
and the subjects saw things upright again.
Finally, the psychologists removed the optical system. At first things
appeared to be upside down (as the mind continued not inverting), but then
the mind started inverting again and the subjects were back to normal.