They had to use a cool color on their hands and a warm color on their background.
Making a splash with David Hockney Students in third grade learned about the artist David Hockney. We focused especially on his California influenced pool paintings from the 60's and 70's. I saw a similar project on the blog "Kids Artists". The students were focusing on line, shape, and colour while working on these. We also spent a good bit of time thinking about how our hair and body look different when submerged under water.
Artful Artsy Amy: Lesson Plan Wednesday: Color Theory, Op-Art Hands