According to the famed scientist and engineer Buckminster Fuller, the fabric of spacetime is made up of an interconnected matrix of vector equilibrium shapes. See
Vector Equilibrium & Isotropic Vector Matrix
If we think of a single Vector Equilibrium as an atom of spacetime, then this cluster of 7 Vector Equilibrium shapes can be thought of as a Spacetime Molecule.
2.42 x 2.97 x 2.9 inches