"Of course the most difficult thing on the violin is always intonation. The second one is rhythm. If you play in tune, in time with a good sound that's already high level. Those three are the main things."

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Only the four corners of the background remained. It was terribly difficult to fix my eyes on all of them at the same time. My experience was that the most difficult thing of all in art is painting in all four corners at the same time.

— Arnulf Rainer