There are two experiences on which our visual world is based: that gravity is vertical, and that the horizontal stands at right angles to it.


The Ascent of Man, Chapter 5 (p. 157), Little, Brown & Company. 1973


There are two experiences on which our visual world is based: that gravity is vertical, and that the horizontal stands at right angles to it.

There are two experiences on which our visual world is based: that gravity is vertical, and that the horizontal stands at right angles to it.

There are two experiences on which our visual world is based: that gravity is vertical, and that the horizontal stands at right angles to it.

There are two experiences on which our visual world is based: that gravity is vertical, and that the horizontal stands at right angles to it.