I highly recommend Play, by Stuart Brown https://www.amazon.com/Play-Shapes-Brain-Imagination-Invigorates/dp/1583333789/ https://www.amazon.com/Play-Shapes-Bra

I highly recommend Play, by Stuart Brown https://www.amazon.com/Play-Shapes-Brain-Imagination-Invigorates/dp/1583333789/ https://www.amazon.com/Play-Shapes-Brain-Imagination-Invigor... It walks though why and how play is important to both individuals and societies and gives some good advice on cultivating playfulness. P.S. From my experience, it's not that our ability to explore or make random jokes has decayed as we get older, but that we choose to put ourselves in fewer situations where we can use those abilities.