It is the pervading law of all things organic and inorganic,
Of all things physical and metaphysical,
Of all things human and all things super-human,
Of all true manifestations of the head,
Of the heart, of the soul,
That the life is recognizable in its expression,
*That form ever follows function*. This is the law. 
Also styles and fads like "minimalism" and "flat design" are forms that do not follow function but are really forms that enforce function. Which is why they're fads and go away after enough people jump on the bandwagon and realize the fad's flaw and limitations.