Abstract : Hansen solubility parameters (HSPs) have been used for solvent selection to initiate Ostwald ripening for the preparation of hollow structures. In their Communication onpage 455 ff., M. H. Cao et al. achieve accurate synthesis of interior space‐tunable MoSe2 spherical structures (solid, core–shell, yolk––shell, and hollow structures) by this solvent‐selection strategy. The picture shows a dragon bringing the optimal solvent to initiate Ostwald ripening.