Not counting actual parts of the body, how many things can you think of that are normally referred to as a pair, such as shoes? I've got a list of 30.
binoculars
bookends
candlesticks
chaps
chopsticks
contacts
culottes
curtains/drapes
dice
earmuffs
earplugs
earrings
elbow pads
footwear
glasses
gloves
handcuffs
headphones
jeans
jumper cables
knee his
knee pads
knitting needles
mittens
nail clippers
pajamas
pantaloons
pants
pantyhose
pliers
scissors
shorts
skates
skis
snowshoes
socks
speakers
sunglasses
tongs
tweezers
twins
underwear
wings
wristbands
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We do not see things as they are, we see things as we are.