Have jerky, uneven movements. That's just the opposite of a metronome or clock. Think of it in terms of birds flitting across the lawn. Look easy to catch.
Cats are opportunists and can be very lazy at times.
Few, however, can resist an object that is just within paw reach. Are moving away. This must remind cats of mice, rats or other potential catches. The general idea is to dangle or pull the object and get your cat to bat or chase it. The rod makes it easier to play with for you and prevents injuries from claws and teeth.