- tetrahedron – the simplest enclosure one might make with sticks, a cage of four windows, four corners, and six rods. This is our minimum tent and we float it in zero gravity space, or under the ocean’s surface, to make the point that none of the four facets is “special” in being a “base”
- Tetrahedra are especially important from a geometric perspective, whereas “connecting the dots” (via the six relationships) is a metaphor for “systematic thinking” and/or “thinking in the round” — what we mean by heuristics.
- four modules interconnect is taken up within each. The choice of four is by design, as these comprise the vertices of a tetrahedron and six relationships.