Textiles and Science

"Hooks and eyes: That was the description of bonds between atoms that Pauling learned when he was an undergraduate at the Oregon Agricultural College. Each atom had a certain number of hooks that allowed it to attach to other atoms, and a certain number of eyes that allowed other atoms to attach to it. A chemical bond (a bond between atoms that held them together as molecules) resulted when a hook and eye connected."
http://osulibrary.oregonstate.edu/specialcollections/