What happens when the ponzo illusion occurs?

The Ponzo illusion occurs when two horizontal lines of equal length appear to be different in size due to the surrounding context of converging lines, like railroad tracks. Our brain interprets the converging lines as depth cues, leading us to perceive the upper line as farther away and, therefore, larger than the lower line. This visual misperception highlights how our brain processes spatial information and depth perception, demonstrating the influence of context on visual interpretation.