Examine a commercial colour wheel showing the range of shades and values. Look through the layers of coloured acetate transparencies to see what happens to colours. Mix the primary colours using water and food colouring. Place petri dishes with water in them on the overhead projector. Mix food colouring.
Students can see the changes on the screen.
Mix colours in milk. Have students try to mix the shade of T-shirt they're wearing. Find shapes that are geometric and shapes that aren't. Ask the students to list characteristics of geometric and non-geometric shapes based on the examples they've found. Look for symmetrical shapes in magazine pictures, art works and children's book illustrations.