E carries an egg timer with her. She always keeps the timer on, so her day is cut to multiple intervals by the egg timer.
When she works, she starts the timer, trying to fully dedicate herself to the job until the timer rings, at which time she starts the timer again to relax as much as possible, until it rings, again.
E likes this timer idea, so she uses this methodology to think about the methodology itself.
That’s how E came up with pomodoro.