This adds a perch to either side of the standard cubby, which does two things at once. It gives your cat more choices, curl up out of sight behind the fabric when the house is busy, or step out onto a ledge for the full panorama. It also makes the cubby easier to reach, since those side platforms act as landing pads on the way up the wall.The front fabric is where you set the mood. Go blank or brick for a closed-off, private feel, pick the porthole or baby dragon cutouts for a playful lookout, or choose the slotted panel for a semi-enclosed spot that stays breezy. It is built for 16 inch stud spacing and installs without fuss.