In spite of the small size of bacteria we are able to "see" it thanks to growing it on a plate with appropriate broth. Bacteria characterized by a huge diversity of morphology, starting with color, texture ending with shape of colony and their odor. In this photo we can see a plate with bacterial smears. From the left: Serratia marcescens, at the top: Micrococcus luteus and on the right: Staphylococcus epidermidis.