The construction of a giant mirror for a telescope is not a simple feat. Here we see the casting and construction of the giant mirrors that will be installed in the Magellan telescope under construction. The sheer size of glass, The nanometer precision in curves, the carefully calculated optics and adaptive software required for handling make this colossal achievement. The 'Magellan' telescope is expected to be completed around 2025 and is located in the city of La Serena, Chile.