Matisse spent the early part of his life immersed in the textile industry. The patterns and rhythms that surrounded him as a child seeped into all of his painting—not only into those with hanging rugs painted into their backgrounds. Matisse, like Cezanne, wanted to temper his rhythms with balanced compositions, as he saw the Renaissance masters had produced. By carefully composing, Matisse kept his paintings symmetrical, balanced, and stable. Pollock, however, was willing to disregard balance and harmony to a large extent, focusing on rhythm, repetition, and movement almost purely.
(and by the way, I hope you’re not disappointed–you didn’t really think i was going to show you pictures of naturally occurring letters, did you?)