Underground is an incredible children book published in 1976 and drawn and written by David Macaulay. It is supposed to be a didactic and schematic explanation about the urban underground (foundations, sewers, subways etc.) but thanks to superb axonometrics from below and without the earth, this book acquire a beautiful artistic dimension. One would have then noticed the humorous touch of placing characters on those drawings’ ground which fits with the lowest level of the buildings’ foundations.

Underground by David Macaulay. Boston : Houghton Mifflin, 1976

Other books
by Macaulay are available on google books (to some extents) including Unbuilding