MacMahon, Percy Alexander, 1854-1929 · Cambridge [Eng.] The University press · leaf 101
lise that a pretty pattern must always be an object, and a principal object, in the designer's mind. This can best be accomplished by paying attention to symmetry of shape. We must learn how to select boundaries which will produce symmetrical patterns. This matter must be studied in the case of… … b N^ c L Fig. 103. iA is the reflexion of A in a mirror placed to its right, or it is A rotated about its right-hand extremity, in a plane perpen- dicular to the plane of the paper, until it occupies the position of iA. It will be noticed that if A be the original single straight line, inversion…
Mathematical recreations
Internet Archive · Cornell University Library · Public domain (published before 1931). Free to use for anything.
