# Toy

## Icosahedron ball

Dec 28th

This icosahedron balloon is one of my favorites to make. Kids love playing with this balloon and tossing it around. I’ve posted a smaller version of this balloon before, but this is the large version (more than a foot in diameter.) It is made from six 260 balloons with a large round in the middle. (I like to use a polka-dotted balloon.) Each 260 balloon is used to create one basic unit, and after twisting six of them, you connect the six units with the balloon ends to form the icosahedron (20 faces.)

Check out this paper from Vi Hart, which contains instructions and pictures for making this balloon.

## Princess wand

Nov 24th

Speaking of princesses (continuing from my last post on Princess Mel)… all princesses need a wand!

Here I’ve made a simple wand that is probably ~2.5 feet long. It takes little time to make. I used one 260 balloon, one 160 balloon, and one heart balloon. Spiraling the balloons is quite easy, but looks really cool!

If you need instructions, just search for “princess wand balloon” on youtube.com There are many videos! The wand above is very similar to ChiTwister’s wand. If you’d like a more complex wand/scepter, check out this video from Sage the Balloon Sage.

This balloon reminds of a birthday cake candle. I’d just need to replace the heart balloon with a yellow/orange flame. I guess if I ever make a really big cake or need a candle for some other reason, I can try something like this!

## Balloon ball (icosahedron)

Oct 1st

Here’s a balloon ball. Sure, you could just inflate a round balloon, but this is cooler. ðŸ™‚

In mathematical terms, it’s actually an icosahedron – a polyhedron with 20 triangular sides. It may look complicated, but because of its symmetry and basic units, it’s actually quite easy to put together. I first saw this on Vi Hart’s web site, where she has posted great instructions for this icosahedron, as well as many other mathematical shapes, such as fractals, tangles, and other polyhedra! Check it out!

**To make this balloon**, I took three 160 balloons and cut each in half. Each section was then used to make one of the six units. (I wanted to make an icosahedron that wasn’t too big.)

If you’d like to read a mathematical paper written about balloon twisting, check out: Computational Balloon Twisting Theory: The Theory of Twisting Polyhedra, co-authored by Hart, Martin Dermaine, and Erik Dermaine (who was one of my college professors!)

## One-balloon teddy bear

Oct 22nd

Someone recently asked me about making a teddy bear, and here’s a one-balloon version. I followed these directions from balloondesigns.net. The purple teddy bear is what you’ll end up with if you follow the instructions above exactly.

**Tips:** You’ll want to leave almost a 5″ tail when pumping the balloon. When twisting the series of seven bubbles to form the head, twist the 4th and 6th bubbles a little smaller than the others, so that the ears will not be so large. You can draw two different faces – one on each side!

The pink teddy bear is another version. This one has a neck, a tail, and uses only one balloon for the body. I left about a 4″ tail to make this one.

## It’s a balloon, it’s a toy, it’s modern art!

Apr 4th

This is basically made from two balloons twisted together, each containing a bouncy ball. I’d call it modern art, but give it to a child, and (after staring at it curiously) it becomes a toy! I got the idea of putting a ball inside a balloon from browsing balloonhq.com, which contains a tremendous amount of helpful information.

How do you get the ball into the balloon? In a future post, I’ll show you a little tool I made with a few items from around the house that you can use to put things into a balloon.