The present invention relates to a structure and a container for culturing cells. In one arrangement, the structure (200) comprises a partially enclosed cavity (204) and a plurality of compartments (201) adapted for fluid communication with the partially enclosed cavity (204). Each compartment (201) is configured to hold one or more cell within its compartment (201) at a location dependent on a dimension of the cell. This arrangement may facilitate visual identification or indication of the size of the cell by observing its location within its compartment (201). The structure (200) may be included or formed integrally with a container (100) such as a Petri dish.