Now the one inside the cubicle can't comprehend his measurements
Because measurements are models made up for and by observers

from Eyedea & Abilities (Ft. Eyedea) – ...Powdered Water Too (Part 1) Lyrics on Rap Genius

Meaning

Essentially the questioning of the physical world, is it real, if so how are we to know what is real, etc. This is also a reference to quantum mechanics which Eyedea seems to be very fond of in that, depending on how certain quantum particles are observed, their position and movement may change.

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