Artists explore themes of vision and cognition for the global expo Works by Hamra Abbas, Asma Belhamar, Afra al Dhaheri, Olafur Eliasson, Nadia Kaabi-Linke, Shaikha al Mazrou, Monira al Qadiri, Khalil Rabah, Abdullah al Saadi, Yinka Shonibare and Haegue...