I had been wondering where I'd first seen this design. At least I finally figured out its origin.
It's a lot of folding, but worth it. And none of the steps are very difficult to understand.
There's a final step where you squash the backside of the design. I didn't realize that. I'll need to try that at some point.
It's a brilliant variation on a classic origami tessellation. Simple, yet complex. As any good tessellatin should be.
Update: I completed the additional steps to recreate the true triphilia tess. Last photo shows it backlit.
This is one of those tessellations that has many simple steps that take up a lot of your time. It really requires a higher level of devotion to the craft.
The final result is pretty spectacular.