I see this as rows of ten windows in ten coloured columns. Others see it differently.
The afghan in the photos was made using a brushed DK yarn, making it very light and soft, and to slightly blur the edges of the squares. I used approximately 240 metres in each of the ten colours.
Any thickness of yarn can be used though this might change the overall size.
It was designed at around the same time Windows 97 was released - hence the name.
Designed by mathekniticians Pat Ashforth and Steve Plummer.