Innis swept back in time to find (define?) two forms of communication: time-based and space-based. The first was essentially oral and physically encumbered, say, with clay tablets. The result was a system of communications limited in scope and immediacy but with objects of long endurance (i.e., the Rosetta Stone). The second was space-based, far-reaching, ephemeral and ever-more immediate.
Innis wrote before the advent of the computer and the Internet, to say nothing of the cell phone. And, now, what changes can follow this time when the means of communication seem to have reached the end of improvement?