The Ancient Greeks had two words for time.

'Chronos' refers to chronological or sequential time: measurable and predictable. 'Kairos' signifies the right time: an opportune moment; a symmetry or synchronicity of circumstances. 

Two flashing lights drift in and out of sync. Both flash at a constant rate but at slightly different speeds, so that eventually they catch up with each other for one flash in unison. They are a jerky dialogue across space: a lopsided syncopation, a looping continuum which waxes and wanes over time.