Siamese Tower is one of the most unique tower in San Joaquín Campus Santiago in Chile . Designed by Alejandro Aravena in 2004. Glasses were used as the main material to build this building. Regarding the glass, the problem was that building a glass tower in Santiago, means automatically to take care of the greenhouse effect, so an outer single glass skin, very bad in energetic terms, but very good against weathering was designed.
this is the link to the website (taken from Archi Daily).