Fuller saw ephemeralization as an inevitable trend in human development. The progression was from “compression” to “tension” to “visual” to “abstract electrical” (i.e., nonsensorial radiation, such as radio waves, x rays, etc.). Length measurement technologies in human development, for example, started with a compressive measure, such as a ruler. The compressive technique reached an upper limit with a rod. For longer measures, a tensive measure such as a string or rope was used. This reached an upper limit with sagging of the string. Next was a surveyor’s telescope (visual). This reached an upper limit with curvature of the earth. Next was radio triangulation (abstract electrical). The technological progression was constantly greater length-measuring ability per pound of instrument, with no apparent upper limit.