This is a variation of 'Origami Spiral 2' by Tomato Fuse. You just don't fold the rabbit ear ;-))
Folded from 4 triangle pieces of paper. And…. it's only one spiral, but you see two, due to the mirror ;-D
When you use thinner or a bigger size of the square, which you divide in two, you won't see any white. I used 15x15 cm.
Diagrams in the Japanese book ISBN4-480-87262-0.
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