One eye or two
The way I heard it, using only one eye lets us see shape relationships, not their relative depths in the field of focus. One of the keys to painting, it seems to me, is to get the "shapes" down first.
By using one eye, we see more of these (shape) relationships. Later, you can open both eyes and begin modeling, which will begin the process of adding/subtracting depth. It lets us deal with one problem (related, though they are) at a time.
Dick Budig
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