Definition that contains optical illusion
- movement an optical illusion of motion produced by viewing a rapid succession of still pictures of a moving object
- motion an optical illusion of motion produced by viewing a rapid succession of still pictures of a moving object
- canal (astronomy) an indistinct surface feature of Mars once thought to be a system of channels; they are now believed to be an optical illusion
- mirage an optical illusion in which atmospheric refraction by a layer of hot air distorts or inverts reflections of distant objects
- apparent movement an optical illusion of motion produced by viewing a rapid succession of still pictures of a moving object
- apparent motion an optical illusion of motion produced by viewing a rapid succession of still pictures of a moving object