tick-tock, tick-tock

“There is certainly a universal and unconscious propensity to impose a rhythm even when one hears a series of identical sounds at constant intervals... We tend to hear the sound of a digital clock, for example, as "tick-tock, tick-tock" - even though it is actually "tick tick, tick tick.”
― Oliver W. Sacks, Musicophilia: Tales of Music and the Brain