Please Explain: Bertrand Russell in Williamsburg

We spotted this strange piece of streetart off Driggs Avenue in Williamsburg. We read the Wikipedia entry on Bertrand Russell, and learned a lot of interesting facts: he won the Nobel prize for literature and was an outspoken anti-war activist, and in 1931 became an Earl. His philosophical work was varied but always marked by his belief in the value of mathematical precision and logic. He apparently knew the deal about a lot of things-- but to what in particular was the writer of this piece referring? Does anyone know?