Hello Kitty is the world's most valuable exercise in subtraction: a round white cat-head reduced to two dot eyes, a yellow nose, six whisker lines, and one red bow — the mouth deliberately left off so anyone can project their own mood onto her. Born on a Sanrio coin purse in 1974, she turned kawaii into a global grammar.

This system takes that discipline seriously. It is minimalism disguised as cuteness: every shape a fat circle or pill, every edge blushed pink, nothing sharp, nothing loud. Bubblegum grounds, chalk-white cards, one perfect red bow as the only bold note. Leave the mouth off, and the whole world smiles back.