You know how you love playing with blocks and shapes? Stellation is like playing with shapes, but a little bit fancier. It means taking a shape, like a star or a cube, and adding little spikes or blocks to it.
Let's say you have a five-pointed star. You can make it bigger by adding more little triangles to each point, making it look like it has more points. That's stellation!
Another example is a cube. To stellate a cube, you add more little cubes to each of its sides, kind of like building a bigger cube out of the smaller ones. This makes the cube look more complicated and cool!
So basically, stellation is just when you take a shape and make it more fancy by adding more shapes to it!