Ayani Manduca Mateus (R) and Txana Bane Fabiano Sales, members of theHuni Kuin, a shamanic tribe from north Brazil, sit at the sculpture "Borda Doce" (Sweet Border) during the presentation of a retrospective of the work of Brazilian artist Ernesto Neto at the Guggenheim Museum in Bilbao, February 13, 2014.[Photo/Agencies]