An illustrated cover is on <i>Introduction to The Design and Analysis of Algorithms</i> 2nd ed (2007) by Anany Levitin [1].<p>In the beginning of the Preface, we find the following:<p>---<p>The most valuable acquisitions in a scientific or technical education are the general-purpose mental tools which remain serviceable for a life-time.<p>-- George Forsythe, "What to do till the computer scientist comes," 1968<p>[1] <a href="https://archive.org/details/introductiontode0000levi" rel="nofollow">https://archive.org/details/introductiontode0000levi</a>