The 'Bubble' (What is it?)
It's called simply "Bubble," and although it's a pretty thing at first glance it's not particularly obvious what it's purpose is exactly. What does a bubble do? Well apparently this one is meant to sit on.
Even after hearing it I don't quite get it -- it looks a little uncomfortable to sit on because it's made of plexiglass-like material, so that shape is what your bum gets. But they are super cute, especially in a little group. They come in blue, yellow, red, or clear, and your choice of round (shown) or cylindrical, and cost £99.