Interstice (noun) in·ter·stice
plural — interstices
1a: a space that intervenes between things, especially one between closely spaced things
b: a gap or break in something generally continuous
2: a short space of time between events
Have you ever seen the play Rosencrantz and Guildenstern Are Dead? The play (also a movie) is a retelling of Shakespeare’s Hamlet from the point of view of the courtiers Rosencrantz and Gildenstern, minor characters who inhabit the interstices of the action of Hamlet.