Am I going too fast to carry my readers with me to these obvious conclusions? Surely a moment’s reflection, and a single instance from common life, must convince everyone that our whole social system is based upon Regularity, or Equality of Angles. You meet, for example, two or three tradesmen in the street, whom you recognize at once to be tradesmen by a glance at their angles and rapidly bedimmed sides, and you ask them to step into your house to lunch. This you do at present with perfect confidence, because everyone knows to an inch or two the area occupied by an adult Triangle: but imagine that your tradesman drags behind his regular and respectable vertex, a parallelogram of twelve or thirteen inches in diagonal:⁠—what are you to do with such a monster sticking fast in your house door?