here. We discussed the idea of "tricking the eye." Then we looked at some examples of other black and white op art, noticing how these lines all start from a point and the lines get wider as they move away from the point.
Then we also looked at a tennis ball with a flashlight shining at it from one side, to see what the light source did to the ball, noticing where the lights and darks were. Students used three sizes of bottle lids to trace a large, medium and small circle. I had them draw a small sun with an arrow in the upper left hand corner to remind them where their light source was. I find this helps as children start shading.
I showed them how holding their spheres at arm's length helped them to see the 3-D effect. I saw a lot of children having their friends hold up their art across the table so they could appreciate the illusion. So fun to see kids cooperating!!
In part 2 of this lesson, students will add color to their spheres with crayons, cut them out and glue them (using size and position to give the illusion of depth) on their black and white op art piece. If we have enough time, some of the classes may add another colored element, too. I will share when these are done.