Solution: Have a different kind of object for each role in the UI

Handling domain (model), handling display (view), handling user input (controller)

Very common even today.

A Model broadcasts any changes in its information.

(This is what most objects that you design are.)

A View gets user input via a Controller and displays information from the Model.

A Controller determines how information can be manipulated.

(relatively low-level -- we avoid it mostly)