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Unless Stoll upsells an ACME 4th dimensional rotator unit?

(Limit 1 per customer. Subject to availability and export controls.

ACME regrets to inform its amiable clientele that a recent site visit to our manufacturer for the new Banach-Tarski Playkit has revealed that although the raw spheres have been delivered and are in-process, they are likely to remain on backorder for an unbounded amount of time.)

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At the Joint Math Meeting, I set up a huckster table, selling Klein bottles. I put up a sign, "SPECIAL BANARCH-TARSKI TWO-FOR-ONE SALE". About the only place I could pull off that stunt...

Hi Cliff, I have two of your Klein bottles which I very much enjoy, but recently I've had a hankering for something without quite so many embedded Möbius bands -- have you ever tried to make a glass Boy's surface by any chance?

Smiles back to you, oh creator of forks!

I've tried several times to make a Boys Surface. It's really hard to do. Bending tubing around its own radius - really challenging. Easy to kink, difficult to get uniform. I've commissioned my friend Lucas Clarke and he's had encouraging results; alas but I've seen too many shards of 30mm diameter borosilicate tubing.

Will keep trying...

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