Freericks say's theres no Roman art left or to that affect. Mmmmmm. What about those painted tiled floors in England? If you ask me, I'd have to say, I.D. the slides, put them in a water tight coffin, bury it 6ft down, in a cool weather location(anywhere, north of central Washington, east or west) and one day, maybe, someone might find them or not, as the case may be.
But I think I like the, "Give them to a younger Railfan." best, as he may as he gets older, do the same and so on and maybe down the line, the technology will be there to take a slide of the 1960's and make it live forever. I don't know. I'll let you know in 800 years if I see any of my old work................
P. Diurni