Inherent capabilities and limitations

  How are you made? What are your inherent capabilities and limitations? Where do you come from? Are you expensive? How difficult is it for an artist to obtain you? How does he obtain you? How difficult is it for an artist to use you? Discuss how at least o​‌‍‍‍‌‍‍‌‍‌‌‍‍‍‌‍‌‌‌‍​ne artist has employed you into their service. Have they achieved varying results from you? Were you chosen by the artist or were you requested? Which century where you used?