I remember the first painting problem that really engaged me. I tried to paint the sky seen between two buildings so that the whole of my painting would be nothing but an empty blue space. I wanted the painting to be filled with a pale empty sky. I thought it would be very easy to do, but found it nearly impossible. The painting was a failure and I had to put it off for a long time.
In a way, my concerns now are not much different in that I want the maximum sense of color, light, and space with the most simple and direct means. I think the Japanese painter Ike No Taiga (1723–1776) was right: the most difficult thing to achieve in painting is creating a space where absolutely nothing has been painted.