Building and biological systems are similar in multiple ways. For example: 1) As it was mentioned, the bones are the structure of the building but also the walls can be related to our muscles. These two are the ones that give volume and support our bodies. 2) The architectural design can be seen as the DNA of the building since every architect has his own style and designs. 3) The windows can be considered the eyes of the building; through them you can see outside of it. 4) The wastewater systems can be related to the digestive system of a person.