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 The "SF Gate" expressed concern that the book could encourage children into aggression and gun-love. Will Chapman has circumvented Lego's opposition to modern weaponry by casting his own non-functional lego guns: he constructed aluminum molds from a CNC mill and injection-molded plastic from melted-down Lego bricks. On 29 January 2013 a woman from Hyannis, Massachusetts, USA reported that her 5-year-old son was threatened with suspension after making a Lego gun in an after school class. 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