艺术家必须自由，甚至要从自身中解放。
The artist must be free, even from himself.
I fell off my pink cloud with a thud.
Natural experiments can provide valuable insights into economic questions.
La belleza no es un lujo, sino una necesidad del alma.
所以，根基树立不牢的人，不要期望有茂盛的枝叶。