Bridget Riley : paintings and drawings 1951-71

When Bridget Riley first exhibited her black and white abstract paintings in the 1960s, people were amazed at how they seemed to move. It was like she was painting with electricity and the patterns were live wires!
This style of painting is known as op art. Op artists put colours, shapes and patterns together in clever ways to create an optical illusion. This can make an image look like its moving!