What is De Stijl?
De Stijl, meaning “Style”, was a group of Dutch artists who created abstract art which adhered to vertical and horizontal geometry. The group was founded by Piet Mondrian and Theo van Doesburg. Mondrian left De Stijl when Van Doesburg began using diagonal geometry.
Photograph is the term used for a picture taken with a camera using film and then printed using special chemicals and procedures which result in a photograph image on light sensitive paper. It is a mechanical process requiring real devices, chemicals and a photographer.
Found objects, objet trouvé in French, are items which an artist finds and incorporates within a work of art. Collectors have been displaying aesthetic objects in collections for centuries. But modern art uses objects with non-art functions, such as recycled or repurposed materials.