This is variation
On mobile: swipe left/right on the image for a new variation (this can take a second), swipe up/down to render the same image with another color variation.
This type of triangle subdivision is described here.

The identifier from this field can be used to regenerate the exact variation you are seeing. When refreshing the page with F5, the value from this field will be used.

A similar artwork has been minted on FXHash. The JavaScript code has been brought down to only 636 bytes, which created 636 unique artworks. One unique piece for every character of code needed to generate them all.