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Principia (🍎) completes the Unity–Echelon cycle of “Breakers-matter Breakers” (from System Gateway).

For example, if you already have the Decoder and Killer installed, then the Fracter costs 2[$] (like Gauss); or even less, if you have an empty Propeller around too. Otherwise, it can still cost 4[$] (like Pressure Spike).

BTW, I like the (Programs trashed as part of installing this program don’t count.) reminder text, especially for a core set.

Flavor-wise, “On the shoulders of giants.” refers to This program costs 1[$] less to install for each other installed icebreaker.: the more Galileo’s and Ibn al-Haytham’s who came before, the easier “Philosophiæ Naturalis Principia Mathematica” was for Newton to come up with (apocryphally, after getting bonked on the head with an apple, as in the artwork).