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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

invert()

The invert() CSS function inverts the color samples in the input image. Its result is a <filter-function>.
invert() css reference