Often, in a spatial database, we are interested in making explicit the representation of geometries that are implicit in the data. In the example that we will use here, the explicit portion of the geometry is a single point coordinate where a field survey plot has taken place. In the following screenshot, this explicit location is the dot. The implicit geometry is the actual extent of the field survey, which includes 10 subplots arranged in a 5 x 2 array and rotated according to a bearing.
These subplots are the purple squares in the following diagram:
