Before the Sphere, the largest spherical building in the world (since 1989) was the Globe in Stockholm.
On it they sometimes project stuff on, which seems to be a way cheaper and energy efficient way than adding a billion LEDs.
Fun fact about the arena Globen, it’s actually the biggest piece in a art installation about our solar system, representing the sun. Pluto is about halfway up in Sweden.
It’s also the home arena of Swedens national ice hockey team.
Guests at restaurants where you get a device that beeps when your food is ready. Guess what? That’s a pager.