Fun in the sun

Someone has tied this rope to a branch of a tree in the park opposite our house. Over the last few days, every time I have looked out of the window there has been someone playing on it. So tonight I took these 4 photos over the course of about 2 hours. Its nice to know that something so simple can bring joy to so many people (young and older!).
Somewhere in the back of my mind I worry that it could be dangerous but the Conventboys just tell me I'm being an old worrywart.