Octagons and Diamonds Origami Tessellation
It's a square grid tessellation using a 32 division grid.
While my first major tessellation was Eric Gjerde's spread hexes, Fujimoto's clover tessellation was probably the very next one I went on to tackle.
Between the two of them, my love of the art was permanently cemented in my psyche.
This is much less complex than either, but still a wonderful exercise in the art of geometric paper folding.