The mysterious pyramids

For months, we've been noticing a growing number of mysterious pyramids outside of the cute house on Delmont, home of the "creative couple" as I now think of them, who grow succulents and vegetables on their rooftop. The female half is a graphic designer; her black puppy and my golden dog played together a couple of years ago in her front yard. The pyramids have been hatching at a slow rate, maybe two a month. They are made of a concrete-like material and have rebar as an armature. They also have squarish holes through the upper part. Finally today, we met the creator. Seven of them, when completed, will be installed at Temescal Park, with telescopes inside them, aimed at "faux" creatures made of bronze, parked at various locations within the park, for kids and other curious ones, to spot. It relates to the idea of the "faux" stream that they created at the park, a stream which had been undergrounded, but is now pumped to run over the ground.