I made this paper mockup in shape of iPhone 6S this morning.

It’s made of fluting paper. I got some from a parcel box.

I can sketch prototypes on blank paper, and cross the prototype through below the pink frame on my mockup, and then ask users questions in agile usability testing.

Blank paper could slide vertically and also horizontally.

我用硬纸壳做了一个纸上原型的底板，可以用剪裁好尺寸的白纸画上原型，然后穿过粉红色边框与底板之间的空隙。这样的纸上原型，可以用来进行敏捷可用性测试。