Long before, in the hazy unrecorded past, someone picked up a piece of transparent crystal thicker in the middle than at the edges, looked through it, and discovered that it made things look larger.

• 前不久，在烟霞无过去，有人拿起一块透明的水晶较厚，在中东，比于边缘，期待通过它，发现它所作的事，看看较大。