Loads of data sciency stuff - one monitor for normal text editing/terminal work, another for accessing remote environments, and a third for a combo of work comms and music.
When not sciencing, I won’t lie, there’s a lot of Path of Exile with PoB on one screen and a podcast on the third.
There’s that and Heroic is doing some excellent work implementing proton and steams stuff into GOG games!
Define container; reasonably, a room could be defined as a container. A container of what? And furthermore, define empty! Knowing when something’s “empty” has all kinds of applications. That and teleporting, even a few inches could be incredible, especially dependent on how often/quickly you could do it. 3 & 7, hands down
Big issue for musicians. Many of us have instruments that are just small enough to be carry-ons but just large enough to be a bit unwieldy compared to other carry-ons, so nabbing primo carry-on storage is a must.