A drawing from memory tells you what your attention chose to keep.

Memory does not store scenes; it stores what you cared about. Try to draw a room you have been in a hundred times and you will produce the window in detail, a chair, perhaps a face, and vagueness everywhere else, because attention was never spread evenly. What comes out is a picture of your interest as much as of the place. Forgetting is selection rather than failure.

Draw or describe something familiar from memory this week without looking, then go and compare. The differences show where you have been paying attention and where you have been passing through.