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BP50 Vertical axis of symmetry vs. no axis of symmetry.
(edit; present; nest [left/right]; search; history)
REFERENCE

M. M. Bongard, Pattern Recognition, Spartan Books, 1970, p. 230.

CROSSREFS

BP152 is the same solution (with the sides switched), using connected shapes and without black filling.

BP1206 was created to be a slightly different version of this: "vertical axis of symmetry vs. no vertical axis of symmetry." (That less specific solution fits this Bongard Problem as well.)

Adjacent-numbered pages:
BP45 BP46 BP47 BP48 BP49  *  BP51 BP52 BP53 BP54 BP55

KEYWORD

nice, stretch, left-narrow, finished, traditional, bongard

CONCEPT symmetry_axis (info | search),
symmetry (info | search)

WORLD

curves_and_fill_shapes_separate_drawing [smaller | same | bigger]

AUTHOR

Mikhail M. Bongard

BP152 No axis of symmetry vs. vertical axis of symmetry.
(edit; present; nest [left/right]; search; history)
CROSSREFS

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

KEYWORD

rotate, stretch, traditional

CONCEPT existence (info | search),
symmetry_axis (info | search),
symmetry (info | search)

AUTHOR

Douglas R. Hofstadter

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