Yes, impossible to say what it is about.

The animations below the video are a little more helpful. Apparently you can import images from a number of sources and arrange them into categories.

But why they write "multi-player system"? Is is a game or a design tool?

I think I just preferred multiplayer over collaborative as a term, risking the misunderstanding. It's a design tool, it doesn't have a game-loop, but it is built on a game engine, and was intended to be more physical and provide more tangible feedback similar to games.

Yes. Videos like that need to show a clear use case that everyone can understand. There was a lot going on but none of it really made any sense.

Ideally 3 use cases, since one may not be relatable to enough people.

The use cases for Grid are pretty broad, we've seen people use it for a visual personal journal to storyboarding games and movies to architects planning projects with their clients.

It's light weight organization for visual thinkers that you can invite anyone too, and we've seen it used most heavily amongst those in the creative industry.

How about tackling one use case where Grid really excels and building up a really strong case and marketing material around that? Like one creative industry project. See https://basecamp.com/tour for an example of making a case study. People can be pretty imaginative about how they can apply a good tool, but right now we (first-timers) can't even see how it clearly works for one specific thing. You may be spreading yourself too thin before you have mindshare and losing people before we even get to see how great the technology is.

I think... it's a collaborative mood board? Did I get it right? Hmm...

I'm guessing Evernote with a fun UI