Along the Road to DIA - Mystery Solved

There are what appear to be weird shaped tanks along the highway near the Denver International Airport.   I absolutely could not imagine what they might be for.
"Cloudscape" by Christopher Lavery - photo from
They are art!

A project by artist Christopher Lavery, “Cloudscape” is constructed out of corrugated metal and cellular plastic. Its function is purely decorative.

They are cute, but I still think they would make good storage tanks.