I liked back in the sixties where you'd turn on the radio and go 'Oh that's Hendrix, that's Creedence Clearwater, that's The Doors, there's The Grass Roots, The Monkees, there's Big Brother. ' You could just instantly hear it and tell. But in the eighties and nineties there's no way you could do that.
I gave one permaculture course in Botswana, and now my students are out in the bloody desert in Namibia teaching Bushmen - whose language nobody can speak - to be very good permaculture people.