This model is a bit unrealistic, of course: cells pick up on the temperature around them but do not impart a differential back to their neighbors.

When the temperature climbed in March, I wandered by the dry cleaner and asked Wang if he'd help me pick up the bike from Worker's Stadium and get it going again.

A network of nerve fibers and receptors pick up feelings such as touch, temperature, and pain, relaying them to the brain.