#1) How has artist Joseph Kosuth raised questions about the nature of art in his composition One and Three Chairs?
Answer: He represented the chair in these three ways to incite out of us the questions of whether this was considered art or not, and Which representation of the cair was most accurate? By turning this chair into an object of debate he opened the door towards a new way of finding meaning in art. If the world does not make sense, why should art.
I hope it helps, Regards.