[quote=@LupusIntus]
An illusionary barrier makes sense: appears like a nondescript building from the outside, nothing can be seen through the windows, people just sort of 'forget' it's there the instant they look away.
It's like THERE in the real world but the barrier just affects outsider perceptions. 

edit:
<Snipped quote by Kuro>

AND SO MAX'S TRIFECTA OF TERROR IS COMPLETE! *confetti rains down*
Shoot though, does Max get like... special glasses to see ghosts? Or are there just multiple residents HE CANNOT SEE!? XD
[/quote]

Max:

[youtube]https://www.youtube.com/watch?v=wzwA1rzL7z8[/youtube]