It means that objects should imply or communicate the correct way to use them without the need for verbal labels. Finger-sized buttons that have a raised surface have affordance, for instance. If a button needs to be labeled Push, there's something wrong.
Doors have a strong need for affordance to keep people moving efficiently and, at the most basic level, not make us feel stupid. A flat metal plate along a door edge affords pushing; short handles afford pulling. All too often, though, doors are not designed with affordance in mind and people try to pull a door that pushes or vice versa. If a door has to tell you to push or pull using words, you know it's a design failure.
If doors should speak for themselves, even more so buildings. You shouldn't have to figure out where the door is, right?
On that note, I wondered what Don Norman would think of this building, which is located near the busy retail corner of Grand and Victoria avenues in Saint Paul:

At least the doors pull outward, as indicated by the handles.
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