Copyright © University of Cambridge. All rights reserved.
Here are four cubes joined together: 

We can draw this arrangement of cubes on dotty paper (isometric paper) which gives us a way of drawing 3D objects more easily: 

How many other arrangements of four cubes can you find? 
Can you draw them on dotty paper? It's more difficult than it looks! 
If you don't have any isometric paper, click here. 