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The mind must be given relaxation; it will arise better and keener after resting. As rich fields must not be forced-for their productiveness, the have no rest, will quickly exhaust them constantlabor will break the vigor of the mind, but if it is released and relaxed a little while, it will recover its powers
Seneca

animation-timing-function

The animation-timing-function CSS property sets how an animation progresses through the duration of each cycle.
animation-timing-function css reference