Saw Dead from the floor, which is very close to the screen. There was some distortion, but it was still pretty immersive and worked reasonably well for the surround shots/sequences, though I did have to swivel and look around behind me. One of the nice things about a sphere, of course, is that there’s always a fairly undistorted view across from you. The Wikipedia article has a shot from a very low+side seat: https://en.wikipedia.org/wiki/Sphere_%28venue%29#Opening
The sound system + sphere geometry is also interesting for similar reasons, you get good sound no matter where you sit. I even brought ear plugs because concerts are always too loud, but didn’t need them in the Sphere show, they seemed to use their ability to achieve uniform coverage to set the volume at loud enoug but non-ear-destroying levels. (The WP article also talks about the sound system.)
The sound system + sphere geometry is also interesting for similar reasons, you get good sound no matter where you sit. I even brought ear plugs because concerts are always too loud, but didn’t need them in the Sphere show, they seemed to use their ability to achieve uniform coverage to set the volume at loud enoug but non-ear-destroying levels. (The WP article also talks about the sound system.)