Old paint on canvas, as it ages, sometimes becomes transparent. When that happens it is possible, in some pictures, to see the original lines: a tree will show through a woman's dress, a child makes way for a dog, a large boat is no longer on an open sea. That is called pentimento because the painter 'repented,' changed his mind. Perhaps it would be as well to say that the old conception, replaced by a later choice, is a way of seeing and then seeing again.

数学家是将咖啡转化为定理的装置。

每个实验都是向自然提出的一个问题，每个结果都是自然的回答。

大爆炸不是一切的开始，而是我们可观测宇宙的开始。