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Square Root is derived from the same idea as From Square To Eternity. The largest unit of From Square To Eternity has eight squares. This design only has seven squares but it is at least twice as wide. It could be made at any size with any number of squares.

The relationship between one square and the next is the same throughout all the variations. Thick yarns will automatically make bigger squares than thin yarns. The starting square can be of any size. The next square - which is not really a square but merely four triangles arranged round the first square to give the impression of a square sitting underneath - is 1.4142 times as wide. Every square is 1.4142 times as wide as the one before.

The number 1.4142 comes from working out the square root of 2 but in real life it is impossible to measure with that degree of accuracy. This is especially true of something stretchy - like knitting. Using 1.4 as the square root of 2 gives an adequate answer in these circumstances. 1.4 is a much friendlier number and produces some nice multiples.

Did this afghan get its name because it uses the square root of 2? Or because it branches out from the centre root which is a square? Or does it depict a route through a series of squares?  All of the above!