Okay, kiddo, let me tell you about picogen!
First, imagine you're playing with building blocks. You can stack them up to make a big tower, right? Well, picogen is like that, but instead of blocks, it uses tiny little cubes called "voxels".
So, what does picogen do with these voxels? It uses them to make really cool and realistic 3D landscapes! This means you can see mountains, valleys, forests, and even oceans, all in your computer!
Here's how it works: picogen starts by making a big box out of voxels. Then, it uses math and algorithms (that's a big word for a special set of rules) to decide where to put each voxel, based on what kind of landscape it's trying to make. For example, if it wants to make a mountain, it will put a bunch of voxels close together and high up.
Once picogen has all the voxels in the right places, it "colors" them to make them look like real mountains or oceans or whatever. It even adds little details like trees or rocks!
So, to sum up: picogen uses tiny cubes called voxels to make realistic 3D landscapes for us to look at on our computers. Pretty cool, huh?