Coxeter also wrote a long mathematical explanation in his letter, which was beyond Escher's comprehension, as he remarked in a letter to George and C… - M. C. Escher

I was peculiarly moved by the angelic life growing on the ground. I have no idea what sorts of flowers grow there in profusion — I don’t know their names. But I was so moved that I sat down, trying to flatten as few grasses and plants as possible with my clumsy backside... This brought my head quite close to the silent, joyful, exuberant, celestial children of heaven. They are so humble, so quiet, and they do not mind if you observe them, if you think they are beautiful... Nor do they mind if you don’t look at all — they just stand there together all by themselves in the huge stretch of woods and grow and bloom just the same, peacefully, joyfully, and silently. I am absolutely sure that they know nothing of the swinish and filthy behaviour of people in their dirty stinking houses — they know only about heaven.

I could fill an entire second life with working on my prints.

Now, I should like to say something else to you about the connection with music, primarily that of Bach, i.e. the Fugue or, put more simply, the canon.. .It has a great deal in common with my own motifs, which I make turn on various axes too. Nowadays I have such a powerful sense of relationship, of affinity, that when I am listening to Bach I frequently get inspired and feel an overwhelming instinct for his insistent rhythm, a cadence seeking something of the infinite. In the Fugue everything is based on a single motif, often consisting of just a few notes. In my work, too, everything revolves around a single closed contour..