Some things just say happy or joy. When you see them they communicate that feeling to you. Suddenly, within an instant or viewing them, you begin to feel happiness grow within you.
The featured photograph is one that makes me feel happy every time I see it. First it is yellow. Yellow is a warm color and is most often associated with the happier emotions. Second this flower just looks like someone is spreading their arms and jumping for joy. The flower is a Gladiolus. Their name has the word Glad in it. Which is another way of saying happy.
I think it is important to surround yourself with things that have the power to bring a smile to your face. What artwork do you have in your home that makes you happy when you see it?