And what's doing the

而起作用的是
scattering is a slide that looks like this. Okay?

类似这样子的幻灯片
A jail window, right?

监狱里的窗户对吗
Okay, so what it's giving is a row of dots.

它所展现的是一排点
Now I'm going to ask Filip to do two things here.

现在我会让菲利普做以下两件事
First, rotate the slide around this axis, so rotate it like this.

首先将幻灯片绕这个轴旋转像这样转
What do you think will happen?

大家认为会发生什么现象呢
You see, right?

看到了吗对吧
The row of spots is

这些点
perpendicular to the direction of the lines. Okay?

都在这条线的垂线上
And now I'm going to ask him to do something else.

现在我再让他做第二件事
I'm going to ask him to twist the slide like this,

让他像这样弯曲幻灯片