The illusion of value in the shadows vs the lit areas

The illusion of values in shadow areas

In this famous illusion that I've taken from Wikipedia, the value (that is, the darkness) of area A is exactly the same as the value of area B.  This is really hard to see, even if you squint for all you're worth.

Bear this in mind when painting lighter areas in the shadows - they are never as light as they seem at first glance.


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