So I’m reading Six Thinking Hats by Edward de Bono. For my later reference, the hats are:

WHITE HAT

neutral and objective, concerned with facts and figures

RED HAT

the emotional view

YELLOW HAT

sunny and positive

BLACK HAT

careful and cautious

GREEN HAT

associated with fertile growth, creativity, and new ideas

BLUE HAT

cool, the color of the sky, above everything else-the organizing hat