You might want to make this afghan just because it is bold and colourful. You might want to make it, for a child, as a teaching aid.
The design is to be found on the walls of many UK schools as a poster, published by Tarquin Publications.
The afghan came first. It shows fractions from 1 - 12. The first square has one piece, the second square has two pieces, etc. Tarquin were so impressed by the simplicity and clarity of the idea they asked to use it for a poster, about ten years ago. It is still in print and just as popular as it has always been.
This is a very easy afghan to make. It is entirely in garter stitch and is worked in blocks which are then stitched together. This makes it a very portable project. The original was made with Aran weight yarns but you can use any yarn of your choice.
The PDF includes a colouring sheet so you can try out your own colour choices.