# mathematics

## Penny Sierpinski Triangle

Here’s a project we did a long time ago in collaboration with Vi Hart, that somehow never made it into Math Mondays. The idea is simple: lay out pennies on a large horizontal surface, such as a floor, in the pattern of a Sierpinski triangle. How many? Well, the basic triangle with a one-penny size hole

## Math Monday: DIY Tensegrity

A detailed, step-by-step illustration of how to make a tensegrity structure that you may not find in a lot of other places — a frustum of a pentagonal pyramid.

## Building a Mathematical Hanging Sculpture in an Hour

Sculptor George W. Hart recently designed and constructed two five-fold symmetrical sculptures with his “Crystal Flowers in Halls of Mirrors: Mathematics Meets Art and Architecture” class at Aalto University in Helsinki.

## Math Monday: Sonobe Some More

For the Museum of Mathematics Last column, we saw some of the basics of modular origami with the Sonobe unit.  Today’s post is mostly a gallery of a few of the limitless cool things you can do with this unit.  But first, a note about chirality. A three-dimensional object is chiral if it cannot be […]

## How to Remember Pi to 15 Digits

One way to remember the first few digits of pi is to count the letters in the words of this phrase…

## Escher Cookies (with 3D-Printed Rollers)

Create awesome, sweet Escher cookies using 3D printed rollers with MC Escher art on them.

## Math Monday: Linkages – One Last Spin

This is the final installment in our epic Math Monday series on the intricate world of mechanical linkages. See the Linkages series introduction for the MoMath Linkage Kit, an introduction, and general instructions.