As a door swings open, the image of the door on Alex's retina changes from a rectangle to a trapezium, but Alex continues to perceive the door as rectangular.
Explain why this is an example of shape constancy.
52 exam-style questions on Edexcel GCSE Psychology 8.1 Perception, covering 8.1.1 Depth cues, illusions and constancies, 8.1.2 Direct Theory of Perception (Gibson, 1996), 8.1.3 Constructivist Theory of Perception (Gregory, 1970), and 8.1.4 Effects on perceptual set. Each one has a worked solution and a mark scheme showing where the marks go.