An exterior shot of the steel penetration at the perimeter glass. Some design challenges at this stage were firstly ensuring that the steel was thermally broken as it penetrated the glass. Secondly, I needed to ensure that all the silicone joints at the perimeter glass matched with the silicone joints of the main glass sphere. Easier said than done, as all the glass on the main sphere was tilting at a 23.5 degree angle. Ensuring that all the joints matched was expedited using some clever modeling in Grasshopper.