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BP939 Optical illusions vs. not so.
(edit; present; nest [left/right]; search; history)
COMMENTS

Panels on the left hand side contain geometrical objects that appear distorted (to a human) due to surrounding information.

REFERENCE

Vicente Sierra-Vázquez & Ignacio Serrano-Pedraza, Application of Riesz transforms to the isotropic AM-PM decomposition of geometrical-optical illusion images, April 2010, Figure 1.

CROSSREFS

Adjacent-numbered pages:
BP934 BP935 BP936 BP937 BP938  *  BP940 BP941 BP942 BP943 BP944

KEYWORD

fuzzy, anticomputer, subjective, contributepairs, invalid, experimental

CONCEPT length_line_or_curve (info | search),
visual_illusion (info | search)

AUTHOR

Leo Crabbe

BP940 Bongard Problems such that there is a way of making an infinite list of all relevant possible right-sorted examples vs. Bongard Problems where there is no such way of listing all right-sorted examples.
BP386
BP394
BP904
BP926
BP931
BP956
BP997
BP1057
BP1072
BP1146
BP1147
BP1148
BP1149
BP1150
BP1199
BP1200
BP1201
BP91
BP329
BP351
BP538
BP559
BP593
BP801
BP902
BP920
(edit; present; nest [left/right]; search; history)
COMMENTS

Left-sorted Problems have the keyword "right-listable" on the OEBP.


BPs are sorted based on how BP563 (left-listable) would sort them were they flipped; see that page for a description.

CROSSREFS

See right-finite, which distinguishes between finite right side and infinite right side.

Adjacent-numbered pages:
BP935 BP936 BP937 BP938 BP939  *  BP941 BP942 BP943 BP944 BP945

KEYWORD

meta (see left/right), links, keyword

WORLD

bp_infinite_right_examples [smaller | same | bigger]
zoom in right (right_uncountable_bp)

AUTHOR

Leo Crabbe

BP941 JPEG image vs. PNG image.
(edit; present; nest [left/right]; search; history)
COMMENTS

Evidently this solution is stretching the idea of what makes images "different". Each corresponding pair of panels would be parsed as identical in any other case. It is worth noting that if you view this Problem on a template, the solution no longer applies at all.

CROSSREFS

Adjacent-numbered pages:
BP936 BP937 BP938 BP939 BP940  *  BP942 BP943 BP944 BP945 BP946

KEYWORD

less, precise, dual, antihuman, contributepairs, invalid, experimental, funny

AUTHOR

Leo Crabbe

BP942 Square bounding box vs. oblong rectangular bounding box.
(edit; present; nest [left/right]; search; history)
CROSSREFS

Adjacent-numbered pages:
BP937 BP938 BP939 BP940 BP941  *  BP943 BP944 BP945 BP946 BP947

KEYWORD

precise, stretch, boundingbox, invalid, experimental, preciseworld

CONCEPT bounding_box (info | search),
square (info | search)

WORLD

rectangular_arrangement_of_white_pixels [smaller | same | bigger]
zoom in left (square_arrangement_of_white_pixels) | zoom in right (oblong_rectangular_arrangement_of_white_pixels)

AUTHOR

Leo Crabbe

BP943 Visual Bongard Problems whose solutions cannot be deduced when viewed in template form vs. not so.
BP300
BP854
BP859
BP941
BP942
(edit; present; nest [left/right]; search; history)
COMMENTS

Left examples are not required to be valid, as long as their solution doesn't apply in the traditional Bongard Problem format (6 panels vs. 6 panels, all one image). Additionally, they do not necessarily have to be rendered invalid by being viewed in the template format, but their solution does have to be altered. In some cases left examples are simply Problems whose solution is specific to the computer medium (BP941), however some examples have more profound solutions that the pen-and-paper template medium is too restrictive to represent (BP854).

CROSSREFS

See BP568.

Adjacent-numbered pages:
BP938 BP939 BP940 BP941 BP942  *  BP944 BP945 BP946 BP947 BP948

KEYWORD

meta (see left/right), links, oebp, time

WORLD

bp [smaller | same | bigger]

AUTHOR

Leo Crabbe

BP944 Image of Bongard Problem that would sort ANY image of a valid Bongard Problem on one of its sides vs. image of Bongard Problem whose categorization of a BP image would depend on the solution or examples in it.
(edit; present; nest [left/right]; search; history)
COMMENTS

"Any" here means any image of a Bongard Problem in the relevant format, i.e. with white background, black vertical dividing line, and examples in boxes on either side.


All examples shown in this Problem clearly sort themselves on the left or right.


A self-referential but maybe simpler solution is "would sort all examples in this whole Bongard Problem on one of its sides vs. not so." Users adding examples please try to maintain this: for any example you add to the right of this Bongard Problem, make sure it does not sort all the other examples in this Bongard Problem on just one of its sides. - Aaron David Fairbanks, Aug 26 2020

CROSSREFS

Adjacent-numbered pages:
BP939 BP940 BP941 BP942 BP943  *  BP945 BP946 BP947 BP948 BP949

KEYWORD

hard, challenge, presentationinvariant

WORLD

boxes_bpimage_sorts_self [smaller | same | bigger]
zoom in left | zoom in right

AUTHOR

Jago Collins

BP945 Cube number of dots vs. non-cube number of dots.
(edit; present; nest [left/right]; search; history)
CROSSREFS

Adjacent-numbered pages:
BP940 BP941 BP942 BP943 BP944  *  BP946 BP947 BP948 BP949 BP950

KEYWORD

precise, allsorted, number, left-null, help, preciseworld

CONCEPT cube (info | search)

WORLD

dots [smaller | same | bigger]

AUTHOR

Leo Crabbe

BP946 Can be constructed using 2 identical copies of an image (full overlapping not allowed) vs. not so.
(edit; present; nest [left/right]; search; history)
COMMENTS

"Full overlapping not allowed" means you cannot overlay an image onto itself without moving it; if this were allowed all images would be sorted on the left. The copies can be moved around (translated) in 2D but can not be flipped or rotated.


There are examples on the right drawn with thick lines, and these could be created by copying an image with slightly thinner lines and moving it over a tiny amount. If you fix this issue by saying "the copy has to be moved over more than a tiny amount" then the Bongard Problem is perfect but not precise, but if you fix this issue by saying "interpret the figures as made up of (infinitesimally) thin lines" then it's precise but not perfect. - Aaron David Fairbanks, Jun 17 2023

CROSSREFS

Adjacent-numbered pages:
BP941 BP942 BP943 BP944 BP945  *  BP947 BP948 BP949 BP950 BP951

KEYWORD

nice, notso, creativeexamples

AUTHOR

Leo Crabbe

BP947 BPs where users are advised to only upload images in which the pixelation is not misleading vs. other "perfect" Bongard Problems that use pixelated images to closely approximate the actual intended shapes.
BP1
BP31
BP210
BP211
BP217
BP279
BP321
BP324
BP325
BP335
BP341
BP367
BP386
BP523
BP548
BP859
BP860
BP861
BP892
BP920
BP934
BP935
BP966
BP1008
BP1088
BP1089
BP1090
BP1093
BP1104
BP1131
BP1156
BP1161
BP1168
BP1183
BP344
BP559
BP564
BP912
BP937
BP949
BP965
(edit; present; nest [left/right]; search; history)
COMMENTS

Left examples have the keyword "pixelperfect" on the OEBP.


All examples here are perfect Bongard Problems. That is, subtle imperfections in images are meant to be considered.


When a Problem is tagged with "pixelperfect", users are reminded to make sure they do not upload images such that taking the pixelation into account would affect the sorting of that example. That is, the zoomed-in jagged blocky version of the picture should still fit the solution.


For example, in the examples of BP335, which is about tessellation, the pixels interlock properly.

CROSSREFS

Stable Bongard Problems are generally pixelperfect.

Adjacent-numbered pages:
BP942 BP943 BP944 BP945 BP946  *  BP948 BP949 BP950 BP951 BP952

KEYWORD

meta (see left/right), links, keyword, instruction

WORLD

perfect_bp [smaller | same | bigger]

AUTHOR

Leo Crabbe

BP948 Image of Bongard Problem such that pixel-inverting examples flips the solution vs. image of Bongard Problem such that pixel-inverting examples leaves the solution invariant.
(edit; present; nest [left/right]; search; history)
CROSSREFS

See BP556 (keyword blackwhite) for the version with links to pages on the OEBP instead of images of Bongard Problems.

Adjacent-numbered pages:
BP943 BP944 BP945 BP946 BP947  *  BP949 BP950 BP951 BP952 BP953

KEYWORD

meta (see left/right), miniproblems, presentationinvariant

CONCEPT black_white_inversion (info | search)

AUTHOR

Leo Crabbe

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