conversation piece

/K AA0 N V ER0 S EY1 SH AH0 N P IY1 S/
noun
  1. 1

    An unusual item, such as a painting, or a tabletop knick-knack which encourages comment from visitors, and so helps to break the ice.

  2. 2

    A painting of a group of people engaged in conversation or some other activity, popular in 18th century.

Source: https://en.wiktionary.org/wiki/conversation%20piece