Seriation 

Very understandable . Thank you

Your explanation really have the rhythm of making things fall into the mind

Great Explanation.Thanks.

Digging down through 20/21C midden pits (landfills) I suspect one would find for beverage containers: age of plastic, age of aluminium, glass.... For music several overlapping ages of: CDs, cassettes, 8-tracks, vinyl; current age of streaming would leave little waste of a uniquely identifiable form.

Very useful, thanks.

thank you!!!

Thanks.