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BP151 If the circle closest to the cross is removed, the rest form an equilateral triangle vs. not so.
(edit; present; nest [left/right]; search; history)
CROSSREFS

Adjacent-numbered pages:
BP146 BP147 BP148 BP149 BP150  *  BP152 BP153 BP154 BP155 BP156

KEYWORD

traditional

CONCEPT correspondence (info | search),
length_line_or_curve (info | search),
near_far (info | search),
number (info | search),
mentally_remove_object (info | search),
equilateral_triangle (info | search),
triangle (info | search)

AUTHOR

Douglas R. Hofstadter

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

BP153 Predominance of curves and hook-like endings vs. predominance of straight lines and staple-like endings.
(edit; present; nest [left/right]; search; history)
CROSSREFS

Adjacent-numbered pages:
BP148 BP149 BP150 BP151 BP152  *  BP154 BP155 BP156 BP157 BP158

KEYWORD

traditional

CONCEPT line_or_curve_endpoint (info | search),
specific_style (info | search),
specificity (info | search)

AUTHOR

Douglas R. Hofstadter

BP154 Wedged endings vs. rounded endings.
(edit; present; nest [left/right]; search; history)
CROSSREFS

Adjacent-numbered pages:
BP149 BP150 BP151 BP152 BP153  *  BP155 BP156 BP157 BP158 BP159

KEYWORD

traditional

CONCEPT curved_straight (info | search),
line_or_curve_endpoint (info | search),
imagined_line_or_curve (info | search),
imagined_entity (info | search),
specific_style (info | search),
specificity (info | search)

AUTHOR

Douglas R. Hofstadter

BP155 Curves are longer than straight lines vs. curves are shorter than straight lines.
(edit; present; nest [left/right]; search; history)
CROSSREFS

Adjacent-numbered pages:
BP150 BP151 BP152 BP153 BP154  *  BP156 BP157 BP158 BP159 BP160

KEYWORD

traditional

CONCEPT curved_straight (info | search),
length_line_or_curve (info | search),
specific_style (info | search),
specificity (info | search)

AUTHOR

Douglas R. Hofstadter

BP156 Three spatially separated clusters vs. two spatially separated clusters.
(edit; present; nest [left/right]; search; history)
CROSSREFS

Adjacent-numbered pages:
BP151 BP152 BP153 BP154 BP155  *  BP157 BP158 BP159 BP160 BP161

KEYWORD

traditional

CONCEPT number (info | search),
feature_cluster (info | search),
cluster_of_one (info | search),
cluster (info | search),
two (info | search),
three (info | search)

AUTHOR

Douglas R. Hofstadter

BP157 White background vs. black background.
(edit; present; nest [left/right]; search; history)
CROSSREFS

Adjacent-numbered pages:
BP152 BP153 BP154 BP155 BP156  *  BP158 BP159 BP160 BP161 BP162

KEYWORD

dual, boundingbox, blackwhite, traditional, bordercontent

CONCEPT background (info | search),
bounding_box (info | search),
outlined_filled (info | search),
texture (info | search)

WORLD

zoom in left (curves_and_fill_shapes_drawing)

AUTHOR

Harry E. Foundalis

BP158 Some slope vs. another slope.
(edit; present; nest [left/right]; search; history)
CROSSREFS

Adjacent-numbered pages:
BP153 BP154 BP155 BP156 BP157  *  BP159 BP160 BP161 BP162 BP163

KEYWORD

dual, arbitrary, rotate, traditional

CONCEPT line_slope (info | search),
specific_value (info | search),
specificity (info | search)

AUTHOR

Harry E. Foundalis

BP159 Two clusters of 2+3, middle shape must be seen as rectangle (AND only one linelike shape) vs. two clusters of 2+3, middle shape must be seen as piece of straight line (AND more than one linelike shape).
(edit; present; nest [left/right]; search; history)
CROSSREFS

Adjacent-numbered pages:
BP154 BP155 BP156 BP157 BP158  *  BP160 BP161 BP162 BP163 BP164

KEYWORD

convoluted, unwordable

CONCEPT number (info | search)

AUTHOR

Harry E. Foundalis

BP160 Quadrilateral that is nearly a triangle vs. typical quadrilateral.
(edit; present; nest [left/right]; search; history)
CROSSREFS

Adjacent-numbered pages:
BP155 BP156 BP157 BP158 BP159  *  BP161 BP162 BP163 BP164 BP165

KEYWORD

perfect, traditional

CONCEPT imperfection_small (info | search),
number (info | search),
triangle (info | search)

WORLD

Multiple options:
[smaller | same | bigger],
quadrilateral_outline [smaller | same | bigger]

AUTHOR

Harry E. Foundalis

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