Rain Sail by Team Strada, Alexa Rosse and Ari Miller&lt;br&gt;&lt;br&gt;Constructed of recycled billboard material, this structure features hammocks under saillike wings of fabric that collect rain to power generators and light the structure at night.&lt;br&gt;&lt;br&gt;Photo by Jack Ramsdale. Courtesy of the Schuylkill Center for Environmental Education.