You can find it in art history books, Wikipedia
Peking opera the white color symbolizes sinister
Sad he is mostly sad but its kinda like a teen moment where all emotions come together
TU increases with an increase in consumption of a commodity as long as MU is positive. In this phase, TU increases but a diminishing rate as MU from each successive unit tends to diminish. ... When consumption is increased beyond the point of satiety, TU starts falling as MU becomes negative.
