## Double, Double, Toile and Trouble...

InteriorDesignFilter: I have three 22x28" baroque frames that I need to fill.
posted by erstwhile on Mar 11, 2012 - 6 answers

## 1 + 10 + 100 + ... = -1/9

Mathfilter: In Gelfand's exceptional Algebra text, he is talking about the formula 1 + x + x^2 + x^3 + ... = 1/(1 - x). He uses the Achilles racing the tortoise model when first introducing the formula. He discusses the case x = 10, whence 1 + 10 + 100 + 1000 + ... = -1/9.
posted by wittgenstein on Jul 27, 2011 - 8 answers

## Abstract geometric animations?

Abstract geometric animations?
posted by Tom-B on Mar 29, 2011 - 15 answers

## Identify this geometric novelty toy

What do you call those three-dimensional geometric novelties, consisting of eight cubes, joined to each other at one edge to form one large cube, whose pieces can be flipped around to display different images on the exterior of the large cube? What is the history of this delightful object? What are the geometric priniciples behind it?
posted by Faze on Jan 20, 2005 - 15 answers

## What is the name for the artwork on currency?

About a year ago, someone posted a wonderful link over in the blue that detailed a certain aspect in the design of paper currency, stock certificates, and the like... it had a specific name, but I can't recall what it is — so I can't google for the Mefi thread.

What do you call the geometric drawing comprised of very fine lines and lots of repetition — they look a lot like spiralgraph output — that adorns paper currency, stock certificates, and the like?
posted by silusGROK on Dec 8, 2004 - 11 answers

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