More bi-cultural explorations. As the title says this image is of two cultures. What might not be immediately be apparent though is that the cultures are two species of bacteria, the red one being Serratia marscens and the white tendril-like form, the soil bacterium Bacillus mycoides. The cultures have grown and spread from their original point of inoculation, but then become aware of each other. They appear to be tentatively exploring each other, and perhaps deciding what to next.