1. COUNTABLE NOUN [usually poss NOUN] Your perception of something is the way that you think about it or the impression you have of it.
2. UNCOUNTABLE NOUN Someone who has perception realizes or notices things that are not obvious.
3. COUNTABLE NOUN Perception is the recognition of things using your senses, especially the sense of sight.

COBUILD Advanced English Dictionary. Copyright © HarperCollins Publishers

This "Bokusho" work is a fusion of Japanese calligraphy and genuine cloud photos.