(Reuters) - Visitors look at a piece called "Cinderella" by Portuguese artist Joana Vasconcelos during her presentation of the "Netless" exhibition at Belem Cultural Centre in Lisbon March 1, 2010. The materials used in the piece are stainless steel pans and concrete covers. The exhibition will run from March 2 until May 18, 2010. Picture taken March 1, 2010. REUTERS/ Nacho Doce (PORTUGAL - Tags: SOCIETY)