The common constituents of space and particles must be extended, reach up to the cosmological horizon, and be of Planck radius.

This yields the modern version of Dirac's scissor trick and thus yields the Dirac equation. The constituents also yield the gauge interactions and the different elementary particles - all as observed. Also general relativity with the field equations arises. So it seems that all of nature is described with Dirac's idea.

Simple arguments, almost no math, lead to the common constituents of space and particles, and thus to the unified theory.