A highly advanced civilisation who have well established links with similar neighbouring worlds, uses a high altitude antigravity hub for the beings arriving and departing their sphere.
Since I got my site updated, I thought I should paint something to celebrate.
8k wide - took about 30 hours, I think. Photoshop CC - Cintiq
"Digital Painting Tricks and Techniques", great read and it's helped me a lot.
It's great to see another one from you.