The solution for this Bongard Problem is also a (less specific) solution for BP500, "vertical axis of symmetry vs. no axis of symmetry".
BP1207 is the same solution but using the horizontal axis instead of the vertical axis.
BP1215 is the same solution but with the NW/SE diagonal instead of the vertical axis.
Adjacent-numbered pages: BP1201 BP1202 BP1203 BP1204 BP1205  *  BP1207 BP1208 BP1209 BP1210 BP1211
stub, notso, stretch, left-narrow, traditional
Aaron David Fairbanks