Complex sentence: As the human visual system uses both size and perspective cues to judge the relative sizes of objects, seeing a perspective change without a size change is a highly unsettling effect, and the emotional impact of this effect is greater than the description above can suggest.
Split into simpler sentences: As the human visual system uses both size and perspective cues to judge the relative sizes of objects. Seeing a perspective change without a size change is a highly unsettling effect, and the emotional impact of this effect is greater than the description above can suggest.