"When I play with my cat, who knows whether she is not amusing herself with me more than I with her."

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You should often amuse yourself when you take a walk for recreation, in watching and taking note of the attitudes and actions of men as they talk and dispute, or laugh or come to blows with one another... noting these down with rapid strokes, in a little pocket-book which you ought always to carry with you.

— Leonardo da Vinci