FWIW, first 3 members of a Fibonacci series.

Steve

"Rich" wrote in message
...
wrote:

I don't understand what the double cube is. In the picture it has 1 1
2 where the height is 1, the width is 1 and the length is 2. What does
this mean?

Sounds like it's the size of two cubes side by side. Whatever dimension
you use for the height and width, the length is twice that.