How to p time as a Gallery Attendant?

I work as a Gallery Attendant at an art museum. Basically, I stand on my feet for 8+ hours and make sure no one touches the art. Unfortunately, this is a very slow job and can get excruciatingly boring at off-times. Im trying to find things to do to keep the time for dragging out and to keep my mind of my aching feet. it cant be too conspicuous, since there is a chance patrons might catch me. I already print out little sudoku and crossword puzzles. Any one have any more ideas?