Yeah, pretty cool!
It does bother me a bit that doing anything like we can do at the macro level is really difficult at the micro level. I remain really confused about why TG cannot do small, that which it can do big.
For example, getting the camera down into the space between two real world scale pebbles, and getting an atmo between the two pebbles as if they were two mountains. OR more directly related to OP, why is it easier to detail a stone like the OP when it is really much larger than it looks... Why does it mater, or how does TG know a difference (in a way of speaking)?
My guess is that it must have something to do with processing power. But that still would leave me confused, because the area being processed is smaller.
IN another app, say Maya, There would be trickery too. So going with my example question, two pebbles that you want to make appear as mountains, like a microbe looking up from the dirt. In this case its all fake so you could work at whatever scale and just treat it as you would a normal scene of say a table and a chair. It will look however you want it to, and no one will know just from looking at it if you worked in meters or inches, or millimeters, or whatever.
But in TG, this is a different more interesting question, because TG is all real world scale. Right? So what makes it impossible to go from the micro level to the macro? What is the technical wall that is so hard to over come?
As a last example to illustrate the question I am really asking, more clearly. Imaging going from the size of an atom to the size of your hand, why can't we do that, if we can go from the size of a stone to the size of the earth?
hmmmm, Interspace to outer space in one camera move!!!!

someone do it!
Anyway, I don't understand what makes it hard when everything else (most everything else) is made so easy for us.