A second suggestion is to take 100 photos of the same thing over time. The suggestion was to take it over different days, under different lights, from above, below, etc. The task is to train the eye to see the same things in new ways. The author said photos taken of the item over time can become a kind of visual journal.
A third suggestion that I liked picks up on the notion of a visual journal. It is to actually keep a visual journal. The recommendation is to cut out pictures of things from magazines or books of photos I wish I'd taken. Over time a theme may emerge. For example, I might notice I gravitate to cutting out lots of pictures of flowers, or things that are red, or lots of pictures of hands in different positions. etc.
The only problem with #3 is that while I'm good at photography I'm terrible at making anything three-dimensional. There's a massive disconnect between my brain and my hands.
Anyway, here are my letters I've been able to find so far.
|Clockwise from top left, L, S, V, Z, U, O|