I WONDER - What Is A Circle?

The video tutorial explains the difference between 2D and 3D shapes, using circles and spheres as examples. It provides a simple method to identify whether an object is 2D or 3D by considering if it would lay flat or roll away when placed on the ground.

What happens to a 2D shape when placed on the ground?

In what way does a 3D shape behave differently than a 2D shape?