I subbed today for a middle/high school art teacher.
I've subbed for art more times than I can count. Sometimes, at the elementary level the teacher will want the kids to start a new, small project. However, at the secondary level the lesson plans nearly always say something along the lines of, "students should continue working on projects - they know what to do."
Today I was given typical secondary art lesson plans... with one exception. During 2nd period I got to go down to the library and read the 1st graders. I loved it.
One of the books I read was Hooray for Diffendoofer Day, by (sort of) Dr. Seuss. It is a lot of fun to read aloud.