\line{%
  \hfil
  \picture{img/obstacle-large.jpg}{An image of the third $24\times24$ trial, depicting the tree obstacles introduced into the container  intended to disturb the antlions communication patterns. }{4in}
  \hfil
  \picture{img/2019-10-18-1.jpg}{A 3cm antlion pit}{4in}
  \hfil
}