When an object, such as a full moon, appears smaller when it is higher in the sky compared to when it is near the horizon. This phenomenon occurs due to the perception of size constancy, where our brain takes into account distance cues to interpret the size of objects.
Related terms
Size Constancy: The ability of our brain to perceive objects as having a consistent size regardless of their distance from us.
Visual Illusions: Distortions in perception that can occur due to misinterpretation or misjudgment of visual stimuli.
Depth Cues: Visual information that helps us perceive depth and distance, such as relative size, overlap (occlusion), and perspective.