🟨 Yellow — Easiest
BLACK-AND-WHITE THINGS
DOMINO, PIANO KEYS, YIN-YANG SYMBOL, ZEBRA
🟩 Green
PAIRS OF RODS
CHOPSTICKS, CLAVES, KNITTING NEEDLES, SKI POLES
🟦 Blue
THINGS THAT ROTATE ABOUT A VERTICAL AXIS
BARBER POLE, CAROUSEL, CEILING FAN, LAZY SUSAN
🟪 Purple — Hardest
RODS THAT CURVE AT ONE END
CANDY CANE, CROCHET HOOK, CROOK, CROWBAR