originally posted by Larry Stein:
Ah, you're talking about artificial surfaces. Outdoor hard courts in CA are (were?) some sort of concrete mix. Could be cement, I frankly don't have any idea.
I think that comes closer to clay drinking vessels. I don't believe artificial hard surfaces existed to any great degree in the 60s.
Even with those, depending on how much sand you mix in, I think you can vary the nature of the surface quite a bit.
ETA - but I think you're right that racket spoof has changed the game more than court surface.