Brad-san, thanks for your comment. As you commented, one of the best things about Lego is the 3D. When I was a child, my Lego was mostly just square blocks, and I remember they came in six colors: black, white, red, yellow, blue and gray. Despite the restriction, I was hooked and built many buildings, vehicles, etc.
All parts (tile round) in my Lego Art set are not stackable, but other sets include stackable parts (plate round with solid stud), so one may be able to try 2D+ first.
FYI : The Great Wave created with only tile round
