Too much sunlight to see that well ... thanks, I'll look laterThe cylinder that goes on the inside prevents that. With the cylinder in, there are small channels that allow the water to fill in all the "cubes" like the on the top of old ice trays. If you look closely once the video stops you can see them.
If you pause the video when they hold it up in the beginning, you can see the channels pretty clearly, too.Too much sunlight to see that well ... thanks, I'll look later