Never apologize for showing feeling, my friend. Remember that when you do so, you apologize for truth.
— Benjamin Disraeli; Contarini Fleming (1832), Part 1, Chapter 13
This fascinating image is of Japanese Noh masks showing different emotions. Ironically, in this case it is actually a single mask. It has been designed to show expression changes with a tilting of the head. The mask was fixed to a wall with constant lighting and only the camera was moved. My thanks to Wmpearl (Own work) [Public domain], via Wikimedia Commons, both for taking this fascinating image and then kindly releasing into the public domain.