var vtn_player_type = "vp";var ven_video_key="NjAyNjgwfHwxNDcxfHwwfHx8fHx8";var ven_width="660";var ven_height="409";Paris hosts an auction of works by Andy Warhol, Simon Hantai, Alexandre Calder and other artists that have never come to the art market before.