This hidden door is made from paneling and blends into the wall great, minus the door knob. But there are places in people’s garage or basement where this may fit in nicely for a concealed closet or utility...
Here’s a well hidden bookcase door in both open and closed positions. All the shelves being trimmed out to be extra thick gives additional tolerances to incorporate a door like this. If anyone knows the original source for these pics, let me...