This is a portal room. Trap door goes in the Room you want to place it. Trap door has two nodes to portal to the hidden room. Room has a spiral staircase with nodes to return to original room with the trap door. You have to use your mouse to get to the room once you have used the trap door, your avitar disappears to the hidden room, then scroll up from the trap door moving your screen down to the room by following your avitar name. It is best used when your avi name is not above your head. There are also several standing nodes on the floor, as well as placement spots to add furniture to the room. There are no wall nodes that I could see, so pictures must be made from meshes that use the floor nodes for placement.

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