From a good post on design communication by Jason Severs:
One of the first things you learn in a formal drawing class is to actually see what you observe. If we are asked to draw an object in a still life, say a bottle, we tend towards drawing what we remember about the object (like the average shape of a wine bottle) rather that what we actually see directly in front of us. Our brains – for reasons that I won’t explore right now – summarize the sensory data received through our eyes and in some act of cognition, allows us to recognize that we are looking at a bottle.
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