Full Idea
Physicalism is associated with various asymmetry doctrines, most famously with the idea that the psychological depends in some sense on the physical, and not the other way around.
Gist of Idea
In physicalism, the psychological depends on the physical, not the other way around
Source
Frank Jackson (From Metaphysics to Ethics [1998], Ch.1)
Book Reference
Jackson,Frank: 'From Metaphysics to Ethics' [OUP 2000], p.14
A Reaction
Sounds okay to me. Shadows depend on objects, and not the other way round. It might suggest properties depending on substances (or bare particulars), but I prefer the dependence of processes on mechanisms (waterfalls on liquid water).