Consider the role of objects just now. I mean “Man made” objects like can-openers, paintings, architecture, and carefully preserved printed word.
Consider also what it is to communicate something in a real manner that has significance and remains memorable to your audience. Stories told in person. Gossip, lore, conversation, verbiage. These are indicators, or carriers, of culture.
Objects and words and non-volatile messages define. This is in contrast to mere by-products of the transient impersonal broadcasts and compared to quickly fading newsprint; set against rapidly dissipating media like the ubiquitous radio, airplane contrails, tire-tracks and candy wrappers.