This is a picture of a spinning tunnel in motion.  The shell is fabric, but the entire structure and bridge is steel and aluminum.  This piece was featured in the tunnel of terror, a haunted house put on by a local pop radio station: Z100.  It is designed to be easily assembled/disassembled for mobile or temporary events.  This is not for the weak of heart... or stomach.
 

Horse Mask
They are worn like a backpack. A dual spring sytem allows the mask to move in a horse- like manner. Created for the play Equus, written by Peter Schaffer.