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Rhomb... Download and make


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So I started watching the new series “Defiance” on the TV when this mysterious glowing space shape thing appeared on the screen. I’m afraid that was as far as I got through the program. When I finally looked up from trawling through the ever fascinating Geometry Junkyard and the Wikipedia pages on 3d shapes Defiance had finished. I’m afraid that happens a lot. I do like to go to the cinema with #truelove. She really doesn’t approve if I use my phone to explore internet rabbit holes at the pictures so I tend to be able to watch films right to the end without getting distracted. Just so long as I stay awake.

Anyway, it turns out that the shape is a Rhombicosidodecahedron. It is made from 12 pentagons, 30 squares and 20 equilateral triangles. There is all sorts of fascinating information here on the Wikipedia page. I tried out a few nets before settling on one with five parts spread over two pages. If you are a member you can download the parts and make your own for free. Non-members can join in the fun for £2.50

Score along all the dotted lines (there are loads. Sorry.) then carefully cut out the pieces. Fold along all the crease lines before you start the assembly to ensure crisp creases.

There are a total of five pieces. Two large, slightly different from each other and three smaller pieces all the same as each other. Find the two larger pieces. One has a black dot on a tab, the other has a black dot near an edge. Glue the tab with the dot to the edge with the dot. Line up the parts as accurately as possible.

Accurately glue one of the remaining three pieces to the central pentagon. Use the picture above to help with orientation.

Glue the other two pieces to the central pentagon, again using the picture for alignment.

Starting from the central pentagon, work your way round and up gluing down tabs to make the 3D shape.

Work your way upwards…

…until only the last pentagon remains.

Complete the shape by gluing down the last pentagon. Nice!

The questions remain. Was Defiance any good? Did anyone watch it? Should I go back and try watching it again? What other 3D shapes will distract me if I do?

2 reviews for Rhomb

    Awesome link to the


    Awesome link to the Geometry Junkyard!
    That is one serious Internet rabbit hole.
    Thanks for posting Rob!

    Geometry Junkyard really is awesome. I can spend hours there just looking around. Did you get to the George Hart link? – RI

    • The George Hart link is

      The George Hart link is excellent. And he works in paper too!

      Nice to see he "renders" his models first. I use to have to do 3D in my head at work before I convinced them to buy the software.

  • Lots of great stuff on the

    Lots of great stuff on the Geometry Junkyard. In the software and animations section, there is a great shareware program called, "POLY," that is very helpful in working with Polyhedra. It allows you to flatten them into 2-d to see how all of the shapes fit together. I found it very helpful when I made my Rhombicosidodecahedron, ( with spikes,) back in 2001.



    That’s fantastic Grant! What is it made from? Do you have any other pictures/info?- RI

    • Kite building is my big hobby

      Kite building is my big hobby and "Spikey," is what I call a "Ground Bouncer." It get staked to the ground and when the wind inflates it, it bounces around.

            It is sewn from hot-air-balloon rip-stop nylon scraps that I bought directly from the factory.  It is 6 foot tall, not including the spikes. It is always a big hit at kite festivals that I attend, since the kids get to push it around. If the wind is strong enough, it will sometimes push back.

      • Grant, I don’t suppose you

        Grant, I don't suppose you are going to the West Lakes Kite Fest? It would be great to see Spikey in real life!

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