Tilt Brush: "Sphere"

I read a tip from Nick Lievendag on how to import 350 degr. images into Tilt Brush. So I tried this out and used it to create this sphere, floating in space. When you zoom in, you'll notice other spheres, with spheres inside, so you might experience some Escher-like impressions. I also tried to import the same image ( converted it to hdri first, thanks to a suggestion from Miguelangelo Rosario ), but that didn't work as I expected when importing it into Sketchfab. Guess I just did something wrong. So I used the standard Milky Way surrounding. My favourite brush is still Toon, as I think you can create nice organic shapes with it. The Tilt Brush video is here: https://youtu.be/UQlb9UdnhFE