Dunn has been recently been playing with iridescence, adding more colors while still allowing the metals to shine. This painting of the cerebellar lobe is an example of his newer work.

Listening to him explain iridescence, you can see how his scientific background factors into his art: "[Iridescence] is when you have small crystalline patterns at the microscopic level which break up the incoming light and distribute it a different way, and so you get light coming into your eye from different angles in just a planar surface," he explains. Dunn gets his paintings to shimmer and change under different light with a special technique he developed--and which he keeps under his hat.