Surface appearance effects often make material objects pretty. The definition of function often places a higher priority on protecting the person's safety than keeping them happy and occupied. The people who pay for our services have an impact of the definition of function that needs careful, ongoing scrutiny. Their rights to be happy and occupied are functional too. The justifications for the arts and humanities apply to them too.
Primary Effects
To know what a secondary effect is, you have to know what the primary effect is.