Figure 4: Investigation of the Requirements for a Structurally Stable
Minimum System

One vector of restraint allows ball to define complete sphere  a
quasithreedimensional system. It can define a constantly varying
radius sphere.

Two vectors: a plane  a quasitwodimensional system.

Three vectors: a line  a quasionedimensional system.

Four Vectors: a point  no displacement.

Note the possibility of in place rotating with the position
otherwise fixed by the four vectors of restraint.

The four vectors define the tetrahedron: the first identifiable
"system"  a primary or minimum subdivision of Universe. The ball
tensionally situated at the center of gravity of the tetrahedron.
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Copyright 1999, Estate of Buckminster Fuller, all rights reserved.