I agree, 20 items is way too low for small. 40 items is way too low for large. I've had a small, and I have a medium and a large now...and I never am able to even begin to do what I want to do with my yards. I am creative, and I like making combination pieces. I could easily use 20 pieces to just make *one* object in my yard if I wanted to. Making things like pathways, walls, fences, hedge rows and things of that nature also takes up an enormous amount of items without taking up hardly any space, so yes 20-40 is just too low. 50 for a small, 75 for a medium and 100 for a large would be perfect.

And yes, if you're just going to take 20 separate medium-sized objects and throw them about your yard, it will fill it up. If you actually want to experiment, try creative combinations, create something really artistic and fancy...you're out of luck on all three sizes. Yes, minimalist is an art form, but it shouldn't be the only art form we're allowed to experiment with.