Lots of moved soil, Phaedra.
Years ago, DW and I were working outdoors. I don't remember what the task was but it might have been near the beginning of the
march towards more and more containers in the yard. I used to say that I wasn't much of a container gardener but others might question that. Right now, there are 10 large pots where that tree once grew in the backyard and maybe just as many along the little side walk, out front.
Anyway, way back then, I was starting on some project and ask DW, "Where are we going to find more dirt?." Our neighbor at the time laughed from the other side of the fence. She came around where we could see her and said, "Always the same question, where are we gonna get more dirt?!"
It does seem like an important question. Dirt always has a designated location ... until, you start Container Gardening.

Steve