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BP847 |
| Evokes the idea of symmetry vs. not so. |
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BP848 |
| Lower bound object shown vs. not so. |
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BP849 |
| Loop is time-symmetrical (loop is like ABCBABCBA... instead of like ABCABCABC...) up to rotation of object vs. not so (neither up to rotation nor reflection). |
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BP850 |
| Shape can be maneuvered around the corner vs. not so. |
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BP851 |
| Figure with points (small white circles) can be smoothly deformed within the 2D plane without passing through itself so that all points touch to make the other figure vs. not so (movement out of the plane required). |
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BP852 |
| Object shown below is the "limit" of the sequence above (end result after "infinite time") versus not so. |
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BP853 |
| Prime knot vs. composite knot. |
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BP854 |
| Nothing vs. nothing. |
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