Receiving an offprint a few years later, Escher wrote to Lionel expressing his admiration for the “continuous flights of steps” in the paper, and enclosing a print of Ascending and Descending.

Imitation -- N. imitation; copying &c. v.; transcription; repetition, duplication, reduplication; quotation; reproduction; mimeograph, xerox, facsimile; reprint, offprint. mockery, mimicry; simulation, impersonation, personation; representation &c.