At the age of 10, Mabel submitted a patent to the US government for the invention of "Swing Pants"-a solution to Mabel's swing-less playground. They were jeans with rope sewed to them and two carabiners that could be used to attach to nearly any horizontal outcropping and thus the pants would function as a swing. The patent was never filled because Mabel was a 10 year old and did the submission incorrectly.