The exposed grain of a worn wooden floor inspired this technique, which was used to create a series of drawings of distorted trees and birds titled Natural History. For 10 points each:
[10m] Name this technique that involves rubbing a sheet of paper on an uneven surface with a soft pencil. It was adapted by its creator into a similarly-named technique for oil painting.
ANSWER: frottage
[10e] The techniques of frottage and grattage were developed by this German Surrealist, who painted Ubu Imperator and Two Children Threatened By a Nightingale.
ANSWER: Max Ernst [or Maximilian Maria Ernst]
[10h] Ernst reassembled Victorian steel engravings for his macabre works in this genre, which often featured his alter ego Loplop and include A Week of Kindness and The Hundred Headless Woman.
ANSWER: collage novels [prompt on collages or novels]
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