It may look like a middle-school art project.

But this painted glass bottle is expected to fetch around $1 million at a Sotheby’s auction next week.

The 78-year-old work of art was done by acclaimed Belgian surrealist René Magritte. It will hit the auction block on Feb. 28 after remaining in the collection of Magritte’s widow for more than four decades and then being sold to a private owner.

“The image of a bright blue sky punctuated with white and grey clouds is one of the most iconic in Magritte’s œuvre, often used as part of a paradoxical landscape or superimposed onto various shapes,” Sotheby’s writes in the bottle’s description.

“A cloudy sky soon became one of the artist’s most iconic motifs,” the auction house added.

“Magritte used this image on two bottles; the other one, dating from 1950 and titled La Courbure de l’univers, is now in The Menil Collection, Houston.”