>>7975325I honestly don't know. I've speculated and wondered about them for years. My best guess is that they are (obviously?) intended to be interlocking so they can be stacked in several geometries in 3D space. So, you might build a wall from them and be able to incorporate various 60° & 120° turns, which would increase structural strength for something like a retaining wall, or perhaps a sea wall to break waves or hold back tsunami. Being hollow, maybe they can be filled with gravel/stone for drainage, or perhaps set on their sides to provide drainage pipelines for flood-stage rivers or letting water back off the land after a tsunami.
Or perhaps they could make foundation matrices for large buildings or other structures? The more I look at them the more I imagine there are multiple civil engineering uses for all sorts of land forming. They seem like they could be very useful in mountainous territory to build bridge abutments or hold back unstable areas to prevent or reduce landslides. Once they are set in place, I've imagine they might be filled with various materials, including solid concrete. Possibly they could be used to construct a dam rapidly, or other directional structure to divert water, maybe make locks for canals ....
I really don't know. But, the possibilities are pretty exciting. I'd love to know more & study them, maybe play with them for any of these applications and discover new ones. I also thought that low-lying land or islands that are threatened by rising sea levels could be protected and recovered. The artificial islands that China built in the South China Sea seem yet another potential application: find some shallow water somewhere, stack these up in a perimeter, then fill the center area and you could manufacture entire islands, a few hundred meters or several kilometers across. Just make sure they're anchored on solid bedrock and they would last centuries depending on the type of concrete you make them from.
