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BP1110 The process that turns one object into the other is the same both ways vs. the process changes depending on which object is chosen as the starting point.
?
(edit; present; nest [left/right]; search; history)
REFERENCE

https://en.wikipedia.org/wiki/Duality_(mathematics)

https://en.wikipedia.org/wiki/Involution_(mathematics)

CROSSREFS

This is a special case of BP841 and a generalisation of BP822.

Adjacent-numbered pages:
BP1105 BP1106 BP1107 BP1108 BP1109  *  BP1111 BP1112 BP1113 BP1114 BP1115

KEYWORD

nice, abstract, math, anticomputer, creativeexamples, left-narrow, unorderedpair, rules, miniworlds, dithering

CONCEPT function (info | search)

AUTHOR

Leo Crabbe

BP330 1-D curve vs. 2-D shape.
(edit; present; nest [left/right]; search; history)
CROSSREFS

Adjacent-numbered pages:
BP325 BP326 BP327 BP328 BP329  *  BP331 BP332 BP333 BP334 BP335

KEYWORD

traditional

CONCEPT dimensionality (info | search)

AUTHOR

Aaron David Fairbanks

BP998 X "X _" vs. all are "X _"; X Y.
(edit; present; nest [left/right]; search; history)
COMMENTS

Right:

All are "all but one are ___"; all but one are black.

All are "every other is ___"; every other is solid polygons.

All are "gradually becoming ___"; gradually becoming thickly outlined.

Left:

All but one are "all but one are ___".

Every other is "every other is ___".

Gradually becoming "gradually becoming ___".


Here is another way of putting it:

Call it "meta" when the whole imitates its parts, and call it "doubly-meta" when the whole imitates its parts with respect to the way it imitates its parts. Left are doubly-meta, while right are just meta.


Here is a more belabored way of putting it:

Call something like "is star-shaped" a "rule". An object can satisfy a rule.

Call something like "all but one are ___" a "rule-parametrized rule". A collection of objects can satisfy a rule-parametrized rule with respect to a particular rule.

On the right: every collection fits the same rule-parametrized rule (with respect to various rules); furthermore the collection of collections fits that same rule-parametrized rule (with respect to some unrelated rule that collections can satisfy).

On the left: The collection of collections fits a rule-parametrized rule with respect to the rule of fitting that rule-parametrized rule (with respect to various rules).


Previously, an unintended solution to this BP was "not all groups share some noticeable property vs. all do." It is hard to come up with examples foiling this alternative solution because the rule-parametrized rule (see explanation above) usually has to do with not all objects in the collection fitting the rule. (See BP568, which is about BP ideas that are always overridden by a simpler solution.) The example EX10108 "all five are 'all five are ___'" was added, foiling the alternative solution.

CROSSREFS

The right side of this Problem is a subset of BP999left.

Adjacent-numbered pages:
BP993 BP994 BP995 BP996 BP997  *  BP999 BP1000 BP1001 BP1002 BP1003

EXAMPLE

"Odd one out with respect to what property is the odd one out" would not fit left: even though this example does seem doubly-meta, it is not doubly-meta in the right way. There is no odd one out with respect to the property of having an odd one out.

Similarly, consider "gradual transition with respect to what the gradual transition is between", etc. Instead of having the form "X 'X __' ", this is more like "X [the __ appearing in 'X __']". Examples like these two could make for a different Bongard Problem.

KEYWORD

hard, less, unwordable, challenge, overriddensolution, infodense, contributepairs, funny, rules, miniworlds

CONCEPT self-reference (info | search)

WORLD

zoom in right

AUTHOR

Aaron David Fairbanks

BP116 Polygon stands on side vs. polygon stands on vertex.
(edit; present; nest [left/right]; search; history)
CROSSREFS

Adjacent-numbered pages:
BP111 BP112 BP113 BP114 BP115  *  BP117 BP118 BP119 BP120 BP121

KEYWORD

noisy, traditional

CONCEPT base (info | search),
horizontal (info | search),
uppermost_lowermost (info | search),
vertex_of_meeting_lines (info | search),
vertical (info | search)

AUTHOR

Douglas R. Hofstadter

BP71 There are inside figures of the second order vs. there are no inside figures of the second order.
(edit; present; nest [left/right]; search; history)
REFERENCE

M. M. Bongard, Pattern Recognition, Spartan Books, 1970, p. 237.

CROSSREFS

See BP1022 for a Problem about presence of nesting.

Adjacent-numbered pages:
BP66 BP67 BP68 BP69 BP70  *  BP72 BP73 BP74 BP75 BP76

KEYWORD

nice, finished, traditional, bongard

CONCEPT recursion_number (info | search),
inside (info | search),
recursion (info | search),
two (info | search)

WORLD

[smaller | same | bigger]

AUTHOR

Mikhail M. Bongard

BP1276 Ways of representing the sequence "ABABCBACCBAC" by grouping its elements into equal-sized blocks and relabelling them (identical blocks are represented by the same element) vs. representations of different sequences.
(edit; present; nest [left/right]; search; history)
COMMENTS

The solver isn't expected to word their solution as it is put above, but to notice that the sequences on the left all "agree" with each other under the aforementioned grouping rule. The 12-element sequence in EX10249 can be "squashed down" into the 6-element sequence in EX10251, which in turn can be "squashed down" into the 3-element sequence in EX10252.

CROSSREFS

Compare to BP121

Adjacent-numbered pages:
BP1271 BP1272 BP1273 BP1274 BP1275  *  BP1277 BP1278 BP1279 BP1280 BP1281

KEYWORD

unwordable, notso, arbitrary, sequence

CONCEPT element_grouping (info | search)

AUTHOR

Leo Crabbe

BP267 Odd number of straight line segments vs. even number of straight line segments.
(edit; present; nest [left/right]; search; history)
CROSSREFS

Adjacent-numbered pages:
BP262 BP263 BP264 BP265 BP266  *  BP268 BP269 BP270 BP271 BP272

CONCEPT even_odd (info | search)

WORLD

arial_font_centered_connected_symbol [smaller | same | bigger]

AUTHOR

Merse E. Gáspár

BP810 Figures can be transformed into one another by smooth stretching (intersection points stay constant; paths connecting those points remain), while remaining within the 2d box vs. movement out of the plane required.
(edit; present; nest [left/right]; search; history)
CROSSREFS

All examples here fit left in BP809, a version where the figures are allowed to pass through themselves while being deformed.

Adjacent-numbered pages:
BP805 BP806 BP807 BP808 BP809  *  BP811 BP812 BP813 BP814 BP815

KEYWORD

nice, math, unorderedpair, traditional

CONCEPT topological_transformation (info | search)

WORLD

two_homeomorphic_figures_made_of_curves [smaller | same | bigger]

AUTHOR

Aaron David Fairbanks

BP93 Branches at outlined circle vs. branches at solid dark circle.
(edit; present; nest [left/right]; search; history)
REFERENCE

M. M. Bongard, Pattern Recognition, Spartan Books, 1970, p. 244.

CROSSREFS

Adjacent-numbered pages:
BP88 BP89 BP90 BP91 BP92  *  BP94 BP95 BP96 BP97 BP98

KEYWORD

finished, traditional, bongard

CONCEPT branch_point (info | search),
collinear (info | search),
outlined_filled (info | search),
texture (info | search)

AUTHOR

Mikhail M. Bongard

BP149 Lone square vs. lone circle.
(edit; present; nest [left/right]; search; history)
CROSSREFS

Adjacent-numbered pages:
BP144 BP145 BP146 BP147 BP148  *  BP150 BP151 BP152 BP153 BP154

KEYWORD

traditional

CONCEPT near_far (info | search),
feature_cluster (info | search),
cluster_of_one (info | search),
cluster (info | search),
one (info | search)

AUTHOR

Douglas R. Hofstadter

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