When perfect timing meets forced perspective you get the illusion above, where a seagull appears to be larger than a fully-grown man. The latter is a technique that employs optical illusion to make an object appear farther away, closer, larger or smaller than it actually is. Why? A person perceives the size of an object based on the size of the object’s image on the retina. This depends solely on the angle created by the rays coming from the topmost and bottommost part of the object that pass through the center of the lens of the eye. The larger the angle an object subtends, the larger the apparent size of the object. Continue reading for more.