Hu Zhengyan was a noted seal @-@ carver , producing personal seals for numerous dignitaries . His style was rooted in the classical seal script of the Han dynasty , and he followed the Huizhou school of carving founded by his contemporary He Zhen . Hu 's calligraphy , although balanced and with a clear compositional structure , is somewhat more angular and rigid than the classical models he followed . Huizhou seals attempt to impart an ancient , weathered impression , although unlike other Huizhou artists Hu did not make a regular practice of artificially aging his seals .