There are two types of shapes in Visio: 1-D and 2-D.
When you work with Visio shapes, you can resize them, rotate them, move them around, format them, and so on.
But how the shape behaves when you do those things depends on the type of shape that it belongs to. There are two types of shapes in Visio: one-dimensional shapes (1-D shapes) and two-dimensional shapes (2-D shapes).
Each type of shape behaves a certain way. Once you know the type that a shape belongs to, you will be able to work with it successfully.