对付一个不自由的世界的唯一方法,就是变得如此绝对自由,以至于你的存在本身就是一种反抗。
The beauty of a mathematical proof is in its elegance and the way it reveals the underlying truth in a clear and concise manner.
I have called this principle, by which each slight variation, if useful, is preserved, by the term Natural Selection.  
Light is the most important material in architecture.