Downhill folding

Have you ever tried to fold a piece of paper in half? Now imagine that you are folding a very long piece of paper that goes down a big hill. That's what we call "downhill folding"!

When you fold a piece of paper downhill, you start at the top of the hill and fold it towards the bottom. It's like sliding the paper down the hill while making it smaller and smaller as you go.

But why would someone want to do this kind of folding? Well, sometimes it can be useful for making things that need to fit into small spaces or be easy to carry around. For example, you might fold a map downhill so that it can fit into your pocket. Or, scientists might use downhill folding to make really small devices that can be used for things like medical treatments or electronics.

Downhill folding can be a bit tricky because you need to make sure that the folds are really precise and that the paper doesn't tear. But if you do it right, you can make some pretty cool things!