This logo design project explores the creation of two symbols based on two concepts/ things which have a symbiotic relationship. The themes are bacteria and the human body. 

The one within the green circle is called "bacteria around us" and the one in the grey circle is called "bacteria within us". As for the colour of the outer ring, I designed two versions. One is green, which symbolizes harmony and is also the extracted colour of Thermophilus. The other is a light grey colour extracted from a white grape ball. It symbolizes stability at ordinary times, but it can also have a negative meaning at certain times, suggesting that bacteria can sometimes harm human health.