Portals in large room at MFA - look around from two locations in the room. Walk forward "into" the portal - your screen will flicker as you pass. Take a few steps more to fully enter the space, then look around. You can see the portal back into the room where you entered that Portal.
There might be some "artifacts" from other portals in the same space if you have more than one. Typically to keep one portal from confusing the view from the other, it's probably best to use only one portal in a single space. If you have more portals, at this time it might be best to place them in different spaces.
