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Mathematics, music and arts conference

Heel erg cool, via Marcel Tunnissen, mijn oude buurjongen die mooie, erg ingewikkelde modellen van veelvlakken maakt: De jaarlijkse Bridges Conference (on Mathematics, Music, Art, Architecture, Culture) wordt dit jaar van 24 tot 29 juli gehouden in Leeuwarden, de geboorteplaats

/ Blog

Mathematics, music and arts conference

Heel erg cool, via Marcel Tunnissen, mijn oude buurjongen die mooie, erg ingewikkelde modellen van veelvlakken maakt: De jaarlijkse Bridges Conference (on Mathematics, Music, Art, Architecture, Culture) wordt dit jaar van 24 tot 29 juli gehouden in Leeuwarden, de geboorteplaats

New pictures of the hyperbolic surface

The strange thing has grown since the last post, so here are two new pictures. First one of the whole thing: And under the fold a detail.

New pictures of the hyperbolic surface

The strange thing has grown since the last post, so here are two new pictures. First one of the whole thing: And under the fold a detail.

More hyperbolic crocheting

Remember the blue and green hyperbolic plane made of triangles? In every corner, seven triangles meet. Because a flat plane can be made with six (regular) triangles meeting in every corner, and seven is more than six, there’s too much

More hyperbolic crocheting

Remember the blue and green hyperbolic plane made of triangles? In every corner, seven triangles meet. Because a flat plane can be made with six (regular) triangles meeting in every corner, and seven is more than six, there’s too much

Hyperbolic plane, spring edition

Here is another picture of one of my crochet projects: a hyperbolic plane in fresh spring colours. It’s all curled up because it has a saddle shape everywhere, just like the blue hyperbolic plane I blogged about earlier. This one

Hyperbolic plane, spring edition

Here is another picture of one of my crochet projects: a hyperbolic plane in fresh spring colours. It’s all curled up because it has a saddle shape everywhere, just like the blue hyperbolic plane I blogged about earlier. This one

A torus and a cube with holes

When I made the double torus that Wilfred asked for, I thought about other torus-like shapes. For example a ball with a hole drilled through it, like a bead. And what would a bead like that look like if you

A torus and a cube with holes

When I made the double torus that Wilfred asked for, I thought about other torus-like shapes. For example a ball with a hole drilled through it, like a bead. And what would a bead like that look like if you

Double torus

Because Wilfred asked and I liked the idea, here’s a double torus. Made from a single thread.

Double torus

Because Wilfred asked and I liked the idea, here’s a double torus. Made from a single thread.

Seifert surface in crochet

As I mentioned in a comment to the post on the 3-4-5, my latest project in crochet is a so-called Seifert surface, a surface with a knot as its edge. I came up with the idea from a picture of

Seifert surface in crochet

As I mentioned in a comment to the post on the 3-4-5, my latest project in crochet is a so-called Seifert surface, a surface with a knot as its edge. I came up with the idea from a picture of

I call it the 3 – 4 – 5

Because it has squares for sides that meet with three or five in the corners. Meet my new crocheting project, a regular twelve-sided polyhedron in disguise… As you can see, it’s open on one side: five squares are missing. The

I call it the 3 – 4 – 5

Because it has squares for sides that meet with three or five in the corners. Meet my new crocheting project, a regular twelve-sided polyhedron in disguise… As you can see, it’s open on one side: five squares are missing. The