concrete and bricks. what's keeping this upright — giant blocks of rock. the only energy required is cutting and moving them into place. it is a means of construction that has rather fallen out of fashion. this is sedimentary rock and depending on how old it is you will still find fossils within it and here you can see. . . this has come straight out of the ground, hasn't it? precisely, and this i is an ammonite shell. what we have found is, you can still do it. - it is actually cheaper, faster, far greener still tojust - simply put stone buildings up| so we found that we save 92% of the embodied carbon. had this been a steel cage or steel—framed _ building clad in stone. so very simplyjust cut - the stone out of the body,