Ruby on Rails

I have Titles and People, and I want a single Image class that can
apply to either. I'm reading the Rails API on Polymorphic
Associations, and I'm getting confused by the example. Can anyone
explain how to do this:

Title
has_many :images

Person
has_many :images

Image
belongs_to [either :image or :title]

Thanks very much in advance,

Walter

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