Clouds of Clouds (2008) - Miguel Leal and Luis Sarmento

From the artist's statement:

Clouds of clouds is a random generator of cloud images. Each new cloud is unique and indexed to a particular time (GMT) on a particular day. Its clouds were made on similar dates and at similar times, not necessarily the same year, and are linked to the original web pages.

The basis of the archives are all images indexed with the tags "cloud" or "clouds" on Flickr.

These are not clouds in the atmospheric meaning of the word, but instead entities with which they share a complexity that can be confused with instability, unpredictability and irreducibility. That this is based on a relatively simple visualisation arrangement is another way of indicating that this complexity depends less on what we see on the surface than on the networks of relationships established from it.

Via Ethan Ham's blog