Please enter a short description of a concept or a couple of keywords that you would like our Da Vinci bot to respond to. The Bot will describe the concept in terms that Da Vinci might have used, it might point out that it (Da Vinci) would not have understood that concept (e.g. if it was not understood at the time). Where appropriate, the Bot will also provide images in Da Vinci's distinctive style. Please enter no more than 15 words.