Take a moment and look around yourself. You can easily recognize familiar objects around you. Have you ever considered the difference between a colorful blob as recorded by your retinas and *seeing things*?
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See Laws of Form.
See also
GIBSON, James J., 1986. The ecological approach to visual perception. Hillsdale, N.J.: Erlbaum. ISBN 978-0-89859-958-9. ⇒ James J. Gibson