progress is not linear
everything is not
based on all known before
quantum leaps
eureka moments
spice scientific
discoveries
wave oscillations
sine waves
pendulum sways
periodic motions
propagate changes
equilibrium vibration
earth violent quakes
balances tectonic plates
physical systems
biological systems
human societies
civilizations empires
expand contract
rise fall cyclic changes
Terence George Craddock (Spectral Images and Images Of Light)
http://www.poemhunter.com/poem/nature-impacted-civilizations/