See other sections of this tutorial for instructions on folding other unit variants.
The role of the Vertex Unit is to be placed in the model’s vertices. The standard alignment is with the pyramid’s tip pointing outwards, but it is possible to direct them inwards. Compare this variant with the sunken version.
In case the model exposes the interior of the pyramid more than its exterior, the flap can be placed on the outside of the pyramid instead of inside, as seen below.