Vásárhelyi Győző, known as Victor Vasarely was an artist who is often regarded as the father of Op Art. He began to study medicine in Hungary, but left the race after two years. Wikipedia--Slide sequence alt to willowisp -conc.
-I wonder if I could squirt concentric circles of paint onto a rotating disc like an old scratched record and drag feathers or pine needles through it to create dimensionality? Might be fun to give the preschoolers a chance to experiment with.