Vier schwebende Engel, die beiden oberen inzensierend Weihrauchfässer schwenkend 

This preliminary sketch for a larger composition, "Four Floating Angels", was created by the Early Netherlandish painter Hubert van Eyck, likely sometime during the late 14th or early 15th century. It depicts four angels in mid-flight, the two uppermost holding censer. The drawing is executed in black chalk on paper, revealing the artist's meticulous attention to detail, particularly in the drapery of the figures' flowing robes. This piece, housed in the Städel Museum, offers a glimpse into the creative process of one of the most influential artists of his time.