This is a mask for the female role (Dan) in the Chinese theatre.
The diva.
Strangely, it is not portrayed as a beautiful female but a rather comical. This is because the mask is that of a Cai Dan (the clown). Like all good theatre, the clown is essential.
Within the dan catagory there were the Gui Men Dan (known for the singing), the Hua Dan (specialized in movement and speech), the Wu Dan (the Chinese version of Laura Croft), Lao Dan (the older women) and Cai Dan (the clown).
In this clip you will the beautiful Xi Shi (Hua Dan), followed by the comical Dong Shi (Cai Dan) and mother (Lao Dan)