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+=======================================
+Sugihara Kokichi's "impossible objects"
+=======================================
+: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.
+
+An arrow that always points to the right:
+
+.. raw:: html
+
+   <video controls loop playsinline width="320" height="240">
+    <source src="arrow.mp4" type="video/mp4">
+   </video>
+
+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
+
+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. 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
+
+.. _`Japan House`: https://www.japanhouselondon.uk/
+.. _`SUGIHARA Kokichi`:
+   http://www.isc.meiji.ac.jp/~kokichis/Welcomee.html