Educational toy made in plastic versions. In the mid-1950s, more explicitly engineering-themed construction toys appeared, including plastic girders, columns, and panels that could be assembled into a model curtain wall skyscraper. Later, this Girder and Panel structural system was extended to a Hydro-Dynamic setup by adding pipes, valves, tanks, nozzles, and pumps to allow construction of model plumbing, HVAC, and chemical engineering systems like a simulated distillation column. Other extensions of the system supported suburban-style housing developments (Build-A-Home), or monorail transportation systems (Skyrail). The building toy Lego was originally developed by Ole Kirk Christiansen in Billund, Denmark, in the 1930s. The name
Lego gun Lego gun A Lego gun is a toy weapon which is made out of Lego elements. There are both working guns (that either shoot rubber bands or bricks), but also replicas that do not shoot and have more for detail. Lego's makers have a long-standing policy of not manufacturing realistic modern weaponry (although swords and medieval arms (see Lego Technic) are available), so hobbyists have sought to fill gaps in the market. Jack Streat has produced a number of rubber band guns, including a replica Lee–Enfield bolt-action sniper rifle. He has produced a book, "LEGO Heavy Weapons" (No Starch Press).