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Sugihara Kokichi's "impossible objects"
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:CreationDate: 2019-10-05 12:22:35
:Id: modelli/sugihara-impossible-objects
:tags: - japanese
- 3dPrint
In September 2019, `Japan House`_ hosted a presentation by `SUGIHARA
Kokichi`_, inventor of many optical illusions realised as solid
objects. He had brought some examples, and I took pictures (below).
Recently, I have managed to `re-create some of his models
</cgit/impossible-objects/tree/ambiguous-cylinders.scad>`_.
An arrow that always points to the right:
.. video:: arrow.mp4
:loop: true
:type: video/mp4
:width: 320
:height: 240
This is what it looks like when viewed from above:
.. image:: arrow-from-above-t.jpg
:target: arrow-from-above.jpg
Four blue circles, and four heart shapes, but when seen from the other
side (here, through a plain mirror) it's a blue 4-pointed star and the
four suits of playing cards:
.. image:: card-suits-plus-pointy-circles-t.jpg
:target: card-suits-plus-pointy-circles.jpg
:class: twitter
and this is what they look like from the side:
.. image:: card-suits-plus-pointy-circles-from-side-t.jpg
:target: card-suits-plus-pointy-circles-from-side.jpg
Six squares, or six circles?
.. image:: square-circles-t.jpg
:target: square-circles.jpg
from the side:
.. image:: square-circles-from-side-t.jpg
:target: square-circles-from-side.jpg
A ring of circles, and three concentric circles, but from the other
side it's a ring of squares, and three intersecting circles:
.. image:: braid-and-nested-t.jpg
:target: braid-and-nested.jpg
seen from the side:
.. image:: braid-and-nested-from-side-t.jpg
:target: braid-and-nested-from-side.jpg
detail of the concentric / intersecting circles from above:
.. image:: nested-from-above-t.jpg
:target: nested-from-above.jpg
The four suits of playing cards, but the bottom half is made by the
reflection of the top half:
.. image:: card-suits-plane-t.jpg
:target: card-suits-plane.jpg
Above the mirror, a fish; inside the mirror, its bones:
.. image:: fish-bone-t.jpg
:target: fish-bone.jpg
A flower above the mirror, its flowerpot inside:
.. image:: flower-pot-t.jpg
:target: flower-pot.jpg
There was also a workshop, in which we built this thing:
.. image:: slides-good-angle-t.jpg
:target: slides-good-angle.jpg
If you put marbles on the slides, they roll toward the centre,
appearing to roll upwards:
.. video:: slides-up.mp4
:type: video/mp4
:width: 500
:height: 300
This is how the same object looks from the opposite side:
.. image:: slides-bad-angle-t.jpg
:target: slides-bad-angle.jpg
and another side-view:
.. image:: slides-from-side-t.jpg
:target: slides-from-side.jpg
Marbles, of course, roll downwards:
.. video:: slides-down.mp4
:type: video/mp4
:width: 500
:height: 300
.. _`Japan House`: https://www.japanhouselondon.uk/
.. _`SUGIHARA Kokichi`:
http://www.isc.meiji.ac.jp/~kokichis/Welcomee.html