Good point - but re-normalising doesn't seem to make much of a difference in practice.

I inverted the Y-axis and made the borders a bit smoother. Probably makes it better.

Concerning the new "flat" earth texture, what about making earth_spongy the new default texture of earth and e.g. renaming earth to earth_flat? See screenshot.

It might also make the CR-oldbies happier since the sponge texture looks a bit more like oldschool Clonk Rage earth.