A neptune fountain 

Abraham van Diepenbeeck's "A Neptune Fountain" is a preliminary drawing in black chalk and wash that likely served as a study for a larger, more finished composition. The drawing depicts a dynamic scene of a water fountain featuring Neptune and two sea horses, possibly inspired by classical sculpture. This sketch demonstrates the artist's talent for capturing the movement and drama of a scene through the use of fluid lines and contrasting light and shade, characteristic of his Baroque style. The drawing is part of the Städel Museum collection in Germany.