Paul Hildebrandt is the founder and CEO of Zometool Inc., an educational geometry toy company that commercialized Steve Baer's 31-zone zonohedra system. He describes himself as a 45-year developer of Baer's geometry and is a founding member of Solar Fools.
Zometool is a physical ball-and-strut construction kit built directly on Baer's 31-zone star. The ball has a hole for each of the 31 directions in Baer's system; the struts come in three types corresponding to the A, B, and C line families. The result is a manipulable model of the same geometric space covered by Baer's US Patent 3,722,153.
Hildebrandt describes it as "a physical embodiment of quantum math." The kit has been adopted by scientists for quasicrystal and symmetry demonstrations. Jose Baer considers Zometool "possibly his father's most significant work."
Zometool is distinct from Zomeworks — both names derive from Baer's "zome," but Zometool is a commercial education product company while Zomeworks was a passive solar engineering company.
Hildebrandt is a key member of Solar Fools, the open-source community continuing Baer's passive heating and cooling work. His stated goal is to build houses using Baer's passive heating/cooling technology — closing the loop between the geometric lineage (Zometool) and the thermal lineage (Cool Cell, NSRC) that run in parallel through the Baer archive.