A simple method to prepare porphyrin "wheels" on a micrometer scale is described. It is possible to arrange several types of porphyrin derivatives, including Protoporphyrin TX and Chlorophyll-a, in the form of rings using this method. A mechanism for the formation of these types of assemblies is proposed that is based on the generation of "2D-gas bubbles" which induces aggregation of the porphyrin molecules.