How Does the Haikubator Work?

PHP. One bit of code selects a random image from a directory. The image is placed as the background of an element on the webpage. Another bit of code selects a random line from a text file, of which each line is a separate haiku, and it goes onto the element with the background image. A little formatting with css, and that's it.

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A piece of the sky
shines from the fountain water
birds investigate