"This park pavilion designed by Jiyeon Song uses a complex arrangement of perforations to display different lines of a poem in its own shadow throughout the year. From the site:
There's also a time-lapse video! Ah!
Using a complex array of perforations, the pavilion's surface allows light to pass through creating shifting patterns, which-during specific times of the year-transform into the legible text of a poem. The specific arrangements of the perforations reveal different shadow-poems according to the solar calendar: a theme of new-life during the summer solstice, a reflection on the passing of time at the period of the winter solstice."