The Paleolithic era wasn’t just painting mammoths on cave walls and running screaming from saber-toothed tigers and onrushing glaciers. Inspired by the book Barna Hedenhös by Bertil Almqvist, Swedish builder Sarah demonstrates that it was also important to take time for yourself — to relax and have a good time. The wooden table tennis setup with wooden sticks for the net is adorable, though I question where a pair of Cro-Magnon people got metal frying pans for their paddles. I’m betting it was Doctor Who…