Get ready for some creativity and non-obviousness! When we take a look at US patent number 4,262,900, we see a patent for a "Playground set". The inventor states:
"Swing sets for playground and backyard use are known, including those having slides and arm swings for small children. Also known are treehouses, firemen's poles such as firemen slide down when rushing to get their fire engines, and gym sets, including various kinds of exercise bars and parallel, hand-swinging, or walking bars. However, to date no one has provided a unit containing more than one of the aforesaid recreational items adapted to be used at a single location within confined quarters."
So, he is patenting the right to combine the use of a treehouse and a slide together. No one could have thought of that, except maybe a 4 year old who likes to walk up to his treehouse and then would like to slide down. But, if you ask an expert in the field of child toys, none of them would ever have guessed anything like that!
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