Task: Text Categorization
Input (English): This artist's last finished work, which shows a mythical bird holding an easel and a wavy magic carpet going across from lower left to upper right, is Tempered Elan. His early works--influenced by Impressionism--include Autumn in Bavaria, and he wrote that "each period of culture produces an art of its own" in his book Concerning the Spiritual In Art. His work showing a person riding a white horse shared its name with a movement led by him and Franz Marc. Several of his works were titled Improvisation or Composition followed by a number; one of them, Improvisation 31 is nicknamed Sea Battle. Name this Russian-born painter who spent his productive years in Germany and painted The Blue Rider.
Output (English): Fine Arts