"We have to get the The Way of the Rectangle to stop!" — Ones This page is protected from being moved, though users can still edit it unless it is protected.
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Twelve shows the other Numberblocks how to arrange their blocks into columns and rows and master the way of the rectangle.
Plot[]
Six and Eight see Twelve meditating at a place named Rectangle Retreat (name not mentioned in the episode). They come to her. Twelve says hi to Six and Eight and allows them to watch and tell her if she's making a rectangle. When she arranges 3×4, Six and Eight display their factors and arrays; Six is 2×3 while Eight is 2×4.
They crash into a gong. Four comes by and asks them if she's okay. Twelve then says that they need to concentrate. Next, Twelve teaches them how to turn like a rectangle. Four tries, but being a square, he thinks something is wrong because when he turns he is still 2 by 2! Twelve tells him that Four is a special kind of rectangle that is the same number of blocks wide as tall (2×2).
Four then crashes into Three and Two. He shows them his rectangle rays, but Three says she can't make wide rectangle shapes. Twelve has another method: she asks everyone to stand vertical; they are a tall, thin rectangle. They all start to fly around. Twelve doesn't mind, so she joins in.