An interregnum is a period of discontinuity, an interruption which incorporates an ineluctable emphasis on a relationship to what comes before and to what comes after in a sequence. This contrasts with a near synonym like "gap" which may be random, encompassing neither connotation of interjacency, sequence, continuity, etc. nor formal inter-relation.
Umm, actually I am just going on vacation and may not post until the middle of next week...but I really like the word "interregnum" a lot.
Here's something from the back of the vault to substitute, until then, for actual original thought :
From back in February 2006, my opinions on The Greatest.
See you soon!