This dualistic system, by a simple addition, became a monism, and at the same time furnished the Chinese with a cosmogony.
"Myths and Legends of China" by E. T. C. Werner
A strictly dualistic system recognizes only two Powers in the world.
"Introduction to the History of Religions" by Crawford Howell Toy
How did primitive people come to the peculiarly dualistic fundamental conceptions on which this animistic system rests?
"Totem and Taboo" by Sigmund Freud
For example, a perceiver might be a nonphysical mind in a dualist view in which the mind and its perceptions are epiphenomena that supervene upon the dynamical physical system without having any action back upon it.
Quantum Mechanics as a Simple Generalization of Classical Mechanics