The refractive index of water is 1.33
Through the refraction, objects looks more shallow than the original in the water. Due to the apparent depth less than real deep, the objects underwater change its shape. That’s why it named “ 1.33 ” and this is the exactly falsehoods moment that “ 1.33 ” want to present, A series of touchable Virtual image.
There is a slight folding line on each container. There will be a “ surface ” when the “Yi dian san san ”lays together. That is the original water surface.