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Can you guess what this object is?

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Neil Wyatt06/06/2020 12:42:04
18776 forum posts
733 photos
80 articles

I happened upon this geometric object by chance earlier. It has several interesting properties. If you already know it, don't spoil it for others just yet, but if it's new to you can you guess what some of these are?

It was very easy to create in Alibre (and in any other CAD program) too!



Martin Connelly06/06/2020 12:51:08
1886 forum posts
203 photos

Stephen Fry had one on QI.

Martin C

Alan Johnson 706/06/2020 12:52:30
106 forum posts
16 photos

As Alice said "curiouser and curiouser"

not done it yet06/06/2020 12:58:49
6319 forum posts
20 photos

Guessing it is a shape that maintains the same height whichever way it is stood or while rolling. In other words a peculiar shaped ‘ball’? If I am correct, I have no idea of what other properties it may have. 3-D computer mouse maybe?

Jeff Dayman06/06/2020 13:39:18
2176 forum posts
45 photos

Looks like the Pope's hat to me

blowlamp06/06/2020 13:47:34
1516 forum posts
98 photos

It looks like 4 half cones placed back to back and joined.

AdrianR06/06/2020 13:48:39
540 forum posts
36 photos

Well from the image I can say it is unusual in that it has one side, two edges and four corners.


Sandgrounder06/06/2020 13:50:33
229 forum posts
6 photos

I think it's a face mask before the ear loops are sewn on.

JasonB06/06/2020 16:00:48
21431 forum posts
2448 photos
1 articles

I think it could replace a wet finger.

Danny M2Z06/06/2020 16:13:19
936 forum posts
1 photos

!/2 of a futuristic bra?

pgk pgk06/06/2020 16:18:01
2317 forum posts
293 photos

A high status tanzanite sugar scoop.

camper06/06/2020 16:58:29
12 forum posts

a factory local to me made thousands they thought they were ball bearings, the joys of centreless grinding

Andrew Tinsley06/06/2020 17:05:52
1480 forum posts

Looks like a Mobius strip to me.


lfoggy06/06/2020 17:10:05
167 forum posts
14 photos

Looks a bit like my son's cycling aero 'time trial' helmet.

Neil Wyatt06/06/2020 17:16:34
18776 forum posts
733 photos
80 articles

NDIY is closest, it keeps the its overall height and that of its centre of gravity constant as it rolls.

It's called an Sphericon (I'll have forgotten taht by tomorrow) basically a square with two half-cones on each side, at ninety degrees to each other.

From wikipedia:

Next Andrew - it was discovered by a someone trying to carve a mobius strip without a hole in it.


Oops - muddled it up with the similar Oloid...


They would actually work as ball bearings - but only between two flat surfaces...


Edited By Neil Wyatt on 06/06/2020 17:18:38

Mike Poole06/06/2020 17:48:51
3071 forum posts
72 photos

A tricky thing to measure I would thinksmiley


JasonB06/06/2020 18:31:36
21431 forum posts
2448 photos
1 articles

I'm waiting for Neil to make a metal onedevil

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