How do I get the vase?

Hint 1 of 7:

Try picking up the vase to see what will happen.

Hint 2 of 7:

I bet there's a sensor under the vase that lets tells the laser to shoot.

Hint 3 of 7:

It probably goes off when it detects a change in weight.

Hint 4 of 7:

So all you need to do is find something that weighs as much as the vase.

Hint 5 of 7:

Did you see that bottle floating in the water?