proportion, balance - harmonious arrangement or relation of parts or elements within a whole (as in a design); "in all perfectly beautiful objects there is found the opposition of one part to another and a reciprocal balance"- John Ruskin --4is a kind ofplacement, arrangement
balance wheel, balance - a wheel that regulates the rate of movement in a machine; especially a wheel oscillating against the hairspring of a timepiece to regulate its beat --12is a kind ofwheel --12is a part of timepiece, timekeeper