We are developing rock stacking algorithms that allow today’s robots to re-arrange rocks into stable structures. Building things using found stones without using mortar is called dry stacking and is amongst the oldest known human building techniques. However, it is currently quite challenging to replicate with robots. This situation is unfortunate since autonomous dry stacking would open the door to a variety of really useful applications. Robots could build structures in remote environments without needing a supply of consumable construction materials. There is no environmental impact associated with the production of construction materials, which makes dry stacking ideal for building temporary or large-scale structures, e.g., protection structures in disaster areas or erosion barriers in remote locations.