In numbered sections Berkeley argues that distance is not seen directly but suggested by sensations, the turning of the eyes, blur and the strain of focusing, which experience has linked to touch. He explains the moon looking larger on the horizon, rejects the geometric optics of lines and angles, and concludes that sight and touch have no ideas in common.
A short, foundational work of the psychology of perception and the prelude to Berkeley’s idealism. Download the free EPUB.