If the orientation of a Noh mask changes,it helps to create the illusion of different emotions.
(Click to enlarge)
Noh is an ancient form of Japanese theater. All the performers are male, and some, especially when they play female parts, wear masks. Although the masks are completely rigid and do not change expression, an actor can tilt his head and create a deceptive optical illusion of the mask changing emotions.
And because the mask is "neutral," the performer’s skill at creating emotions with his body and language likely causes the viewer to project the appropriate emotion onto the mask’s face.
The same mask as above, but tilted slightly downward.(Click to enlarge)
And tilted again.(Click to enlarge)
How many emotions can you find projected by this Noh mask?(Click to enlarge)
– The Noh Mask Effect: A Facial Expression Illusion, kaslr.org>>
– Noh, Masks, Wikipedia>>
– The Noh mask effect: vertical viewpoint dependence of facial expression perception. Proceedings of the Royal Society B: Biological Sciences, National Center for Biotechnology Information>>
– The Noh mask test for analysis of recognition of facial expression, Psychiatry and Clinical Neurosciences, Wiley>>