Anti-gravity children

It is a little known fact that there are a few spots on the planet where the laws of gravity does not apply. There is such a spot in our garden and, normally, we keep it fenced off so that no-one gets hurt. Today however, I let the children experience the sensation. As can be seen, Charlie and Anna are getting the full effect, while Sammi is just off to the edge of the anomaly.

Either that, or they are just on the trampoline.