"Wiggly" means a high number of small concavities adjacent to one another all around the outline.

All examples in this Bongard Problem are shape outlines.

Shapes with outlines that are only wiggly within partial sections would be ambiguous. Shapes with outlines that have many medium-size concavities would be ambiguous.

M. M. Bongard, Pattern Recognition, Spartan Books, 1970, p. 216.

Adjacent-numbered pages:
BP4 BP5 BP6 BP7 BP8  *  BP10 BP11 BP12 BP13 BP14

easy, nice, fuzzy, stable, world, finished, traditional, bongard

Multiple options:
mediumsize_centered_outline [smaller | same | bigger],
shape_outline [smaller | same | bigger]

Mikhail M. Bongard

Center of shape's x coordinate is higher than zero (where zero is the middle of the picture).

All examples in this Bongard Problem are small shape outlines.

This is the first Bongard Problem in which absolute positioning is relevant.

Shapes close to the middle would be ambiguous.

M. M. Bongard, Pattern Recognition, Spartan Books, 1970, p. 216.

Adjacent-numbered pages:
BP3 BP4 BP5 BP6 BP7  *  BP9 BP10 BP11 BP12 BP13

easy, nice, dual, handed, leftright, boundingbox, finished, traditional, absoluteposition, bongard

small_outline [smaller | same | bigger]

Mikhail M. Bongard

All examples in this Bongard Problem are oblong connected figures made up of some curves.

Shapes as tall as they are wide would be ambiguous.

M. M. Bongard, Pattern Recognition, Spartan Books, 1970, p. 216.

Adjacent-numbered pages:
BP2 BP3 BP4 BP5 BP6  *  BP8 BP9 BP10 BP11 BP12

easy, nice, dual, handed, rotate, stretch, finished, traditional, bongard

Multiple options:
figure_made_of_curves [smaller | same | bigger],
oblong_axis_aligned_figure_made_of_curves [smaller | same | bigger]

Mikhail M. Bongard

All examples in this Problem are outlines of polygons or solid black polygons.

M. M. Bongard, Pattern Recognition, Spartan Books, 1970, p. 215.

BP1211 is "triangle vs. anything else".

Adjacent-numbered pages:
BP1 BP2 BP3 BP4 BP5  *  BP7 BP8 BP9 BP10 BP11

easy, nice, precise, number, ignoreimperfections, finished, traditional, preciseworld, bongard

Multiple options:
polygon_outline_or_fill [smaller | same | bigger],
triangle_or_quadrilateral_outline_or_fill [smaller | same | bigger]

Mikhail M. Bongard

All examples in this Bongard Problem are outlines of shapes.

M. M. Bongard, Pattern Recognition, Spartan Books, 1970, p. 215.

Adjacent-numbered pages:
BP1 BP2 BP3 BP4  *  BP6 BP7 BP8 BP9 BP10

easy, nice, ignoreimperfections, finished, traditional, bongard

shape_outline [smaller | same | bigger]
zoom in left (polygon_outline)

Mikhail M. Bongard

All examples in this Problem are outlines of shapes or solid black shapes.

M. M. Bongard, Pattern Recognition, Spartan Books, 1970, p. 215.

BP136 is the same solution (flipped) but with only polygonal outlines and also with extraneous dots distracting from the solution.

Adjacent-numbered pages:
BP1 BP2 BP3  *  BP5 BP6 BP7 BP8 BP9

easy, nice, precise, unstable, right-narrow, finished, traditional, bongard

outline_or_fill_shape [smaller | same | bigger]

Mikhail M. Bongard

All examples in this Bongard Problem are single simple shapes.

M. M. Bongard, Pattern Recognition, Spartan Books, 1970, p. 214.

Adjacent-numbered pages:
BP1 BP2  *  BP4 BP5 BP6 BP7 BP8

easy, nice, precise, allsorted, world, gap, finished, traditional, preciseworld, bongard

outline_or_fill_shape [smaller | same | bigger]
zoom in left (shape_outline) | zoom in right (fill_shape)

Mikhail M. Bongard

The meaning of "big" left intentionally vague. There are various specific ways to define size, such as diameter, minimum distance between points on edge, and size of smallest bounding circle.

All examples in this Bongard Problem are single simple shapes, either outlines or solid black.

All examples on the same side are approximately the same size.

M. M. Bongard, Pattern Recognition, Spartan Books, 1970, p. 214.

Adjacent-numbered pages:
BP1  *  BP3 BP4 BP5 BP6 BP7

easy, nice, fuzzy, spectrum, size, stable, finished, traditional, continuous, bongard

outline_or_fill_shape [smaller | same | bigger]

Mikhail M. Bongard

The first Bongard Problem.

All examples in this Bongard Problem are line drawings (one or more connected figures made up of curved and non-curved lines).

M. M. Bongard, Pattern Recognition, Spartan Books, 1970, p. 214.

Adjacent-numbered pages:
  *  BP2 BP3 BP4 BP5 BP6

A circle fits on the right because it is not nothing.

easy, nice, precise, allsorted, unstable, world, left-narrow, left-finite, left-full, left-null, perfect, pixelperfect, finished, traditional, stableworld, deformstable, bongard

zoom in left (blank_image) | zoom in right (curves_drawing)

Mikhail M. Bongard