having the letter a as the tea pot is more interesting than just putting a picture of a tea pot in the middle. Tea - Pouring from such a great height is only for the most reckless of tea drinkers. Or for those with plastic topped table cloths.
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This chart shows the effect of aperture on the size of the starbursts. As you can see, the smaller the aperture, the more emphasized the starburst. The same concepts apply during the daytime as they do during the night time.