The openings that are made with the purpose of illuminating and ventilating structures are called windows. The cages that are made of iron with security and aesthetic purposes in windows are called rails, fence or grating.
Metal cages are usually made of iron, bronze or brass and shaped with forging and forging techniques. Pieces of iron shaped by forging, connection methods to link motifs in the form of cords, rod surfaces with rivets, welding and rings can be seen in many examples.
The use of floral motives, curvy lines is an indication of Art Nouveau movement.