Hillis' Law
The representation becomes the reality.
Or more precisely: Successful representations of reality become more important than the reality they represent.
Examples:
Dollars become more important than gold.
The brand becomes more important than the company.
The painting becomes more important than the landscape.
The new medium (which begins as a representation of the old medium) eclipses the old.
The prize becomes more important than the achievement.
The genes become more important than the organism.