When thinking about the user experience, one really has to think about the kind of information that the end-user needs from you to make a decision about how they are going to interact with and/or consume your product. This means that you need to put yourself in their shoes and think through what they need.
This hand-made wet paint sign is a great example of User Experience Design because it gives you all the information that you need to know how to best interact with the object in front of you.
The sign warns you that there is wet paint, it gives you the colour that is wet, and tells you where the wet paint is situated.
From a UX perspective, the designer of this sign thought through what the risk to the door’s user may be as a result of recently applying a fresh coat of paint to a door (Wet Paint), informed them of which of the colours that were in front of them was the one that could affect them (paint dab), and finally reinforces which of the elements in front of them represents the risk (Doors).
Good UX can be anywhere. It does not need to be limited to screens. The user experience comes into play any time any of the senses and emotions are engaged in any situation.