Okay kiddo, let me explain what a subcontraction map is like you're 5 years old.
A subcontraction map is like a game of shrinking. Imagine you have a big toy car, but you want it to be smaller. So you create a rule that says every time you play with the car, you need to make it half the size it was before.
That's kind of what a subcontraction map does, but with shapes instead of toys. It takes a big shape and squishes it down to become smaller, following a specific rule. This rule usually involves breaking the shape into smaller pieces and making each piece proportionally smaller than the original.
For example, let's say you have a triangle. You can cut it into smaller triangles and make each one half the size of the original. Then you take all those smaller triangles and fit them back together to make a smaller version of the original triangle.
Subcontraction maps can be used in lots of different ways, like in computer graphics to make images smaller, or in math to study the properties of different shapes. But no matter how they're used, they always follow the same basic idea of taking something big and making it smaller by breaking it down and following a rule.