BP50 is the same solution (with the sides switched), using multiple shapes and with some shapes filled in black.
BP1206 is like BP50 but instead of "no axis of symmetry at all" it uses "no vertical axis of symmetry".
Adjacent-numbered pages: BP147 BP148 BP149 BP150 BP151  *  BP153 BP154 BP155 BP156 BP157
rotate, stretch, traditional
Douglas R. Hofstadter