We call it a smart brick that turns waste from a medium-size plastic bottle into a brick, as in the image the plastic bottle will be mixed with cement and sand with certain concrete qualities so that resembling a Lego, and inside the construction process will also be arranged like Lego, however still remain inserted a thin cement for gluing between the bricks, and to increase the strength between the bricks, the bottle cap serves as a lock between the bricks, while the bottom of the brick is printed like a bottle cap. Note that the entire surface of the brick should be printed rather roughly and slightly contoured so that there is a thin gap that will be filled with cement. This without any chemical process, is very simple. For the size is as in the image, where the clear length must be an integer divided by the width, and for the height do not have to 310 mm, it could be 290, depending on the height of the bottle or as needed.