Patrick White 
The Solid Mandala 

This is the story of two people living one life. Arthur and Waldo Brown were born twins and destined never to to grow away from each other. They spent their childhood together. Their youth together. Middle-age together. Retirement together. They even shared the same girl. They shared everything – except their view of things. Waldo, with his intelligence, saw everything and understood little. Arthur was the fool who didn»t bother to look. He understood.