The spell described a space within a space, hidden from all. It supposedly worked better the more people you had cast it. I think everyone else saw it as some sort of secret base or clubhouse, that sort of thing children are often interested in.

I thought... well, there's no History of Asgard here, is there? No story for me to interrogate. But I know a place that not even Thor nor Odin could find. It's where I found you.