Download or read book Principles of Human Knowledge written by George Berkeley and published by Simon and Schuster. This book was released on 2013-01-24 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: Through reflection or introspection, is it possible to attempt to know if a sound, shape, movement, or color can exist unperceived by a mind? This book largely seeks to refute the claims made by Berkeley's contemporary John Locke about the nature of human perception. Both Locke and Berkeley agreed that there was an outside world, and it was this world which caused the ideas one has within one's mind. Berkeley sought to prove that the outside world was also composed solely of ideas.