Some contemporary artists are also experimenting with impossible figures , for example , Jos de Mey , Shigeo Fukuda , Sandro del Prete , István Orosz ( Utisz ) , Guido Moretti , Tamás F. Farkas and Mathieu Hamaekers .
Some artists of the time are also experimenting with impossible figures , for example , Jos de Mey , Shigeo Fukuda , Sandro del Prete , István Orosz ( Utisz ) , Guido Moretti , Tamás F. Farkas and Mathieu Hamaekers .
During three periods of ethnic identification work after 1949 , professors Fei Xiaotong , Huang Xianfan , Xia Kangnong and a lot of academic masters and scholars from anthropology and ethnic study circles made their great contributions .