No axis of symmetry vs. vertical axis of symmetry.
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".
Similar to BP50.
No vertical (or horizontal) axis of symmetry vs. vertical axis of symmetry.
No vertical axis of symmetry vs. vertical axis of symmetry.
Douglas R. Hofstadter