In mathematical quarters, the regular division of the plane has been considered theoretically. ... [Mathematicians] have opened the gate leading to an extensive domain, but they have not entered this domain themselves. By their very nature they are more interested… — M. C. Escher Copy Share Image
![“In mathematical quarters, the regular division of the plane has been considered theoretically. ... [Mathematicians] have opened the gate leading to an extensive domain, but they have not entered this domain themselves. By their very nature they are more interested in the way in which the gate is…” quote by M. C. Escher](https://sms4smile.com/quotes/img-quotes/5cf/m-c-escher-15873_behinds_in-mathematical-quarters-the-regular-div_216361.jpg)