In two experiments, participants estimated the lines constituting the horizontal-vertical illusion, either in perception or imagery task. Results confirmed that there was no significant difference ...

And this new optical illusion is no exception. At first glance, the image looks straightforward enough: horizontal lines running across the screen, with black and white blocks interspersed between ...

Perceived length can differ from actual length, as illustrated by the classic Muller-Lyer illusion. The two horizontal lines are identical in length but the one on ...