I could try leaving some kind of physical door on our end. I don't want to do that on this side, though, that would catapult us into "terrifying urban legend" so fast...

[That's some Night Vale shit right there. He doesn't want to risk their home going sideways if people start conceiving of them as the People Beyond The Doors or something.]

Besides, I couldn't put one everywhere we go. It'd be good to figure out something else, if we're separated while traveling somewhere new or something...what do they feel like, for you?