The larger cylindrical-shaped hydrophobic chain of C12EO10 is contrasted by the smaller, irregular shape of the TX-100 p-tertoctylphenyl. Therefore, even though the EO head has the same length and can cover a similar surface in both cases, the cores have to be organised differently to occupy similar volumes. As the assemblies grow, we observe that one of the dimensions increases, creating prolate micelles. Eventually, the two ends of a prolate micelle might join, creating small amounts of oblate assemblies. Depending on the dynamic growth of the micelle, the bigger void at the centre of spherical cores, observed for the smaller spherical micelles, allows for the creation of the multi-layer structures.