A metallic monolith placed in the middle of a quarry in the immense desert of Utah.
This was discovered, by chance, employees of the department in a remote area of Red Rock Country, last Wednesday.
These members of the Aviation Bureau of the Utah Department of Public Safety were flying over the area by helicopter to survey the population of bighorn sheep.
For now, the author of this "work of art" remains unknown.
Around the glittering triangular block, no inscription indicates how the metal monolith could have landed at this precise spot.
News of the discovery quickly went viral on the internet, with many noting similarities to the bizarre alien monoliths in Stanley Kubrick's film, "2001: A Space Odyssey."
Others joke about the presence of "aliens" in this region.
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"It is forbidden to install structures or works of art without authorization on land managed by the federal government, no matter what planet you come from," the agency said maliciously in a statement released Monday.
A work by artist John McCracken?
The authorities refuse to reveal the location of the "monolith" so as not to attract hordes of curious people, a race is engaged online to determine its location based on the surrounding geological formations.
"Although it is not a work by the late American artist John McCracken, we see it as a tribute from a fellow artist", reacted to AFP a spokesperson for the legal representative plays by McCracken, David Zwirner.
However, later that day David.
Zwirner retracted that statement, suggesting that it was possible that the mysterious monolith was the work of John McCracken.
"The gallery is divided on the subject", he said, saying himself finally "convinced" that the monolith was indeed from the hand of the artist who died in 2011 and that it would not have been discovered for almost ten years.