When I first started playing, I saw a video where someone was building crazy landmasses like 100+ tall archways and flying mountains. Looked fun, but very meticulous if built block by block. The guy in the video, however, was inserting large groups of blocks at a time I believe in a spherical formation and within five to ten minutes had an entire mountain. Is this a mod of some type?
https://legokid222.imgur.com/all/