Achievement Items clip into the wall.

Totes-Bode

Certain items cannot be placed on a surface or in the air, but are "glued" to the wall or floor, and even when you try to move them away, they will slide along the floor or the wall and refuse to pull away. Including:

Lacquered Kwama Egg
Harvester's Herbs

Totes-Bode

Hanging Wedding Lantern - It's glued to the floor, or if you force it along a wall and to the ceiling, it is sunk into the ceiling with only a tiny part on the bottom peeking out.