What is Or even structural rearrangements such as?

Imagine you have a toy box full of building blocks, that’s like a structure. Now, sometimes, instead of just adding or taking away blocks, you might move them around to make something new, that's what structural rearrangements are like.

Think about your favorite puzzle. If it's a picture of a cat, and you take apart the pieces and put them together again to make a dog instead, that’s a kind of rearrangement. You didn’t add or remove anything, just moved parts around to create something different.

Sometimes, when we're talking about things like buildings or even your body, structural rearrangements can happen inside. Like when you grow taller, not because new parts are added, but because the bones inside your body shift and change shape.

It’s just like how you might stack blocks in one way to make a tower, and later take them apart and build something else with the same blocks, still using the same pieces, but making something new. Imagine you have a toy box full of building blocks, that’s like a structure. Now, sometimes, instead of just adding or taking away blocks, you might move them around to make something new, that's what structural rearrangements are like.