While Moxie may be a couple weeks younger than Simon (by all guesstimates), and definitely a smaller cat, she was the first of the two to take to jumping to high places, climbing things, etc. Simon would rather just lay around on chairs and look cute, while Moxie's gotta get up and move!
I think she was just trying to find some good reading!?
Oh, and here's a cute pic of Tucker catching some sun while the blinds were mostly closed.