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 Ninjago in one or two waves across a given year. In 2012, the "Fire Temple" set (#2507) was awarded 'Activity Toy of the Year' title at the 12th Annual Toy of the Year Awards, which is held at the American International Toy Fair in New York City. Various other sets have been released, including a board game from the Lego Games theme along with a number of associated buildable battle game toys. These all involve placing a Lego Minifigure on either a spinning or flying disk. The first generation of these was released in 2011—12, and incorporated a two-player battle game,