Wooden ceilings and timber beams were decorated. Beamed propulsion includes sails pushed by laser, microwave, or particle beams. The roof is constructed of gabled limestone beams. These structural members are used as vertical columns, horizontal beams, and arches. Larger composite headlights replaced the previous rectangular sealed beams. William Fairbairn experimented with cast iron beams and concrete floors. The instrument serves to determine the structure of interfaces using highly collimated neutron beams. There were designs with vehicles supported, suspended or cantilevered from the beams. The heaviest wooden beams, called vigas, lie atop the wall. The figures show two incident light beams (A and B). An active mirror will produce reflected beams that have more power than the incident beams. Image formation is given by the complex modulus of the incoming electron beams. The set was rife with green laser beams and giant artificial phalli. The under structure of beams and carlins is the same as above. For such sources, the MPE is higher than for collimated laser beams.