We placed items on yellow paper and left them in the sun for most of the day. I asked C and R what they thought would happen to the paper and they both thought it would get warm in the sun. C also guessed that the paper would have shadows on it - I thought that was a pretty good guess.
C and R were amazed to see how the sun faded the paper around the items.
We had a little trouble with the cut up straws moving on the paper so we taped them in place but they may have been too transparent to create a sharp image. We will try this again with different items and different colored paper.