It's good to support artists and their work.
Jill goes to the museum and sees a sign that says suggested donation.
Jill wants to enter the museum.
Jill puts some money into the donation box that is displayed.
Jill just walks on into the museum without paying anything at all.
Jill sees the exhibits and feels good about herself for supporting the art in them.
Jill sees the exhibits for free and without having to pay for them.