Your students will "LOVE" these Op Art Hearts, and you can sneak in some lessons about warm and cool colors. They will also learn about how shapes can create illusory contours and how lines can be used to make a heart look 3D.:
Make a great card or wall art with this free download, a Valentine's Day inspired 'Modern art Hidden Heart' colouring activity. Great for children to experiment with how different colours can impact each other. Will the heart 'recede' or 'jump out'?
Art Lesson: Op Art Using Positive & Negative Shapes