Secret walls always look like "
soft"
walls, with the internal filler image, when they aren't adjacent to floor. Since both secret wall and hard wall are a "
floor tile"
, there isn't any thing like "
covering a secret wall with a hard wall"
since they're on the same layer.
This is helpful from a player perspective - if you see a solid block of hard wall you know there's no secret walls in there.
Hope that helps explain!
____________________________
Quick links to my stuff (in case you forgot where it was):
Click here to view the secret text