Unfortunately, no one can be told what the ShapeSheet is. You have to see it for yourself.
Visio SmartShapes can be so much more than just clip-art. This is because the ShapeSheet allows shapes to  …

Learn how to create clean & tidy Visio shapes from .png images that you get from the web! You’ll learn how to remove background clutter from the images so that your images look more like genuine Visio shapes!

Give your Visio diagrams that 80′s arcade look and feel that they’ve been yearning for.

Learn some helpful techniques for importing bitmap images into Visio, then creating shapes and diagrams by tracing over them.