“Simon, always a fool for simplicity, accepted. Punch took an envelope out of his pocket and scribbled on the back of it. He said, 'This has a simple arithmetical proof but no rational explanation of the paradox.' He gave it to Simon. Simon read it, looked at Punch with raised eyebrows, hunched his shoulders, shook his head sadly, and got up and left the room without a word.”
Source: The Curve of the Snowflake (1956), p. 72.
Help us to complete the source, original and additional information
Do you have more details about the quote "Simon, always a fool for simplicity, accepted. Punch took an envelope out of his pocket and scribbled on the back of it…" by William Grey Walter?