There's Something in There...
Several places I've lived there are grates that cover ducts and the like. (No surprise there.) A few times, the design means that you can vaguely see through to someplace else. For example, it's the picture of the day.
Screened Lights
800x600 (80 KB) · gallery page
As far as he knows, entering one of these grates won't take kamoranakrre to another dimension...