On Cornell's campus, there is a pedestrian walkway that traverses the roof of the extended ground floor of the Olin Library. The Olin Library is a classic 1970s modernist building, that some have referred to as "looking like a punch-card."
Now, this walkway to which I am referring has become one of my favorite little places to encounter as I walk across campus. You see, due to the fact that the walkway is on the roof of a lower part of the building, it sometimes has rocks scattered about on it (the rocks are the ballast from the roof below). These rocks are the fun part. When you kick them, as they bounce and roll across the concrete pavers, they go "plink, pl-plink plink plink" in a most beautiful array of staccato tones. It sounds kind of like a xylophone. Hmmm... building-as-musical-instrument. Life shows us beauty in the most unexpected places.