I love to create things in a way that they can be easily uncreated. Most items we buy today, a house, a car, become a burden when they become obsolete. The processes and energy involved to uncreate those objects is huge.
This stone floor on the other hand does not use cement or glue. The big and heavy slabs of stone lay fixed on sandy earth. They can be removed with ease, the moment they no longer serve. There will be no need for force and tools to release them from their current formation. Nor is there need for the creation and maintenance of those tools. The stones can be removed by hand and will not be damaged in this process. They will remain as they where, valuable and ready for reuse. The total energy used to create and uncreate this floor is far less this way.
Eventually everything returns. Therefore look at the things you create in this world. What energy does it cost to create and how much energy will it cost once it serves no more.