I’ve always been fascinated by the idea of consciousness and its inconsistencies (which we call illusions).
One of these is the Ebbinghaus illusion in which the apparent size of an object is influenced by the size of objects around it.
It seems that this effect plays a role in causing the Moon Illusion (in which the Moon sometimes looks enormous when viewed near the horizon). Take a picture of this though and the effect is much diminished.
Today’s invention is a camera app which detects an isolated circle and, if it is near other objects, distorts the image so as to make the circle actually larger within it.
This idea could be extended to a suite of other geometry-based illusions, so that impressive perceptual phenomena could be captured photographically.