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BP859 Black pixel vs. white pixel.
(edit; present; nest [left/right]; search; history)
COMMENTS

This is the "smallest" possible valid Bongard Problem on black and white bitmap images (up to switching sides).

CROSSREFS

Adjacent-numbered pages:
BP854 BP855 BP856 BP857 BP858  *  BP860 BP861 BP862 BP863 BP864

KEYWORD

minimal, blackwhite, perfect, pixelperfect, experimental, funny, unstableworld

WORLD

black_or_white_pixel [smaller | same | bigger]
zoom in left (black_pixel) | zoom in right (white_pixel)

AUTHOR

Aaron David Fairbanks

BP860 Finitely many copies of the shape can be arranged such that they are locked together vs. not so.
(edit; present; nest [left/right]; search; history)
CROSSREFS

This is a generalisation of BP861.

Adjacent-numbered pages:
BP855 BP856 BP857 BP858 BP859  *  BP861 BP862 BP863 BP864 BP865

KEYWORD

hard, nice, stub, precise, stretch, unstable, hardsort, challenge, creativeexamples, perfect, pixelperfect

CONCEPT tiling (info | search)

WORLD

fill_shape [smaller | same | bigger]

AUTHOR

Leo Crabbe

BP861 Shape can be combined with a copy of itself such that they are locked together vs. not so.
(edit; present; nest [left/right]; search; history)
CROSSREFS

See BP860 for the more general version of this solution.

Adjacent-numbered pages:
BP856 BP857 BP858 BP859 BP860  *  BP862 BP863 BP864 BP865 BP866

KEYWORD

nice, precise, unstable, perfect, pixelperfect

CONCEPT tiling (info | search)

WORLD

fill_shape [smaller | same | bigger]

AUTHOR

Leo Crabbe

BP862 Human faces vs. other images.
(edit; present; nest [left/right]; search; history)
CROSSREFS

Adjacent-numbered pages:
BP857 BP858 BP859 BP860 BP861  *  BP863 BP864 BP865 BP866 BP867

KEYWORD

less, teach, anticomputer, culture, experimental

WORLD

black_and_white_photograph [smaller | same | bigger]
zoom in left (black_and_white_face_photograph)

AUTHOR

Leo Crabbe

BP863 Two shapes can tessellate the plane together vs. not so.
(edit; present; nest [left/right]; search; history)
CROSSREFS

Adjacent-numbered pages:
BP858 BP859 BP860 BP861 BP862  *  BP864 BP865 BP866 BP867 BP868

KEYWORD

nice, precise, allsorted, math, hardsort, creativeexamples, unorderedpair

CONCEPT infinite_plane (info | search),
tessellation (info | search),
tiling (info | search)

WORLD

2_shapes [smaller | same | bigger]

AUTHOR

Leo Crabbe

BP869 Approximately symmetric vs. asymmetric.
(edit; present; nest [left/right]; search; history)
COMMENTS

Or, "evokes idea of symmetry (see BP760) vs. not so," which is also a solution for BP847. - Aaron David Fairbanks, Jul 29 2020

CROSSREFS

Adjacent-numbered pages:
BP864 BP865 BP866 BP867 BP868  *  BP870 BP871 BP872 BP873 BP874

KEYWORD

abstract, spectrum, anticomputer, subjective, concept, perfect

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

AUTHOR

Leo Crabbe

BP870 Increasing quantity has upper bound (will get "stopped" by something) vs. not so.
(edit; present; nest [left/right]; search; history)
COMMENTS

Related to BP380.

CROSSREFS

Adjacent-numbered pages:
BP865 BP866 BP867 BP868 BP869  *  BP871 BP872 BP873 BP874 BP875

KEYWORD

creativeexamples, structure, rules

WORLD

constant_change_seq_increase_right [smaller | same | bigger]

AUTHOR

Aaron David Fairbanks

BP882 Vaguely positive vs. vaguely negative
(edit; present; nest [left/right]; search; history)
COMMENTS

Requires cultural knowledge, e.g. for specific warning symbols

CROSSREFS

Adjacent-numbered pages:
BP877 BP878 BP879 BP880 BP881  *  BP883 BP884 BP885 BP886 BP887

KEYWORD

easy, less, abstract, spectrum, anticomputer, subjective, culture, invalid

AUTHOR

Thomas Joyce

BP889 Odd number of enclosed regions vs. even number of enclosed regions.
(edit; present; nest [left/right]; search; history)
COMMENTS

The use of numbers and pictures are only a distraction.


See BP966 for the version in which the background counts.

CROSSREFS

Adjacent-numbered pages:
BP884 BP885 BP886 BP887 BP888  *  BP890 BP891 BP892 BP893 BP894

KEYWORD

number

CONCEPT separated_regions (info | search),
even_odd (info | search)

AUTHOR

Thomas Joyce

BP891 Dots can be connected to create one triangle within another vs. not so.
(edit; present; nest [left/right]; search; history)
COMMENTS

Or equivalently, "3 dots within boundary of convex hull vs. not so". - Leo Crabbe, Aug 01 2020

CROSSREFS

Adjacent-numbered pages:
BP886 BP887 BP888 BP889 BP890  *  BP892 BP893 BP894 BP895 BP896

KEYWORD

nice, precise, allsorted, preciseworld

CONCEPT convex_hull (info | search),
triangle (info | search)

WORLD

6_dots [smaller | same | bigger]

AUTHOR

Cameron Fetter

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