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Spoiler:"It's so simple." - the original Sign Painter
The formulas on the wall appear to be for the force of Gravity (Fg = m*g) and the Spring force (Fs=k*x) of one Goo bond. Assuming there is a damping term (Fd = d*v), the system the elastic physics of one Goo bond operates under would be a damped simple harmonic oscillator.
There is an achievement for finding this Easter egg in the Steam and Games for Windows – Live versions of the game called "Subversive Traveler".
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