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A very effective, easy-to-make, optical illusion.
It can be knitted using any type of yarn, in three colours. The original was knitted in Aran weight in variegated blue and two solid blues. You do not have to work to a particular gauge. If you can knit garter stitch you can knit this.
You work with small units and only have a large piece when you assemble it at the end. Use the basic ideas to make it any size from baby blanket to king-size bed.
The pattern includes a sheet that can be used to try out your own colourways before you begin.