His style is associated with the New Objectivity movement, though he introduced unusual distortions that separate him from his contemporaries. Ket frequently used high or tilted angles to look down at his subjects, creating a sense of spatial tension. He focused on the physical presence of common items like glass bottles, ceramic bowls, and newspapers. His technique involved building up thin layers of oil paint to create a smooth, almost enamelled surface.

Modern collectors find value in the quiet intensity of these compositions. The works provide a sense of stillness and order that works well in contemporary interiors. Pieces such as Korenschoven te Ede or his studies of trees show how he applied his disciplined eye to the Dutch countryside. These prints offer a sophisticated alternative to traditional representational art, capturing a private and carefully observed world.