Skip and Belle spent a lot of time in church. Belle liked the stained glass windows, the colors it gives to the light coming in and how it gave you such a rich view. Skip liked the regular windows, where you can see through the transparent glass and percieve things outside clearly. Not only did they have the different preferences, the windows were located on different sides of the church - so they were looking at different areas outside.
One day the two noticed a stranger listening to them talk about windows. They called out: "You there! Who are you? Which window do you like?" The stranger simply turned around, opened the door and walked out.