Some things are common no matter where you are and how you perceive the reality. You have objects which interact. Find a type of interaction which works at mac

Some things are common no matter where you are and how you perceive the reality. You have objects which interact. Find a type of interaction which works at macroscopic distances and does not depend on inertial mass. You can call it "electromagnetic interaction". Note that some objects interact stronger, and some weaker. Call this property "charge". Find the smallest unit of "charge" and try to split it further, until you cannot split it anymore. Choose the smallest particle of this kind. Congratulations, you found "electron"! Note nowhere in the previous paragraph I have specified how you perceive the reality. Maybe you were looking at the charged oil film on the water surface with human eyes, or maybe you were using your telekinetic senses to feel zorks on the bazzer, or maybe you were sentient gas cloud observing startdust falling in the black hole. It does not matter, once your culture starts exploring interaction of atoms, they will the same physical law, that there is a minimum charge unit, and arrive to the same physics. (or they might not discover that branch of physics at all -- but then they are unlikely to be an interstellar civilization)