Point taken, though from my understanding hunter gatherer groups didn't have a ton of time for leisure...especially anything involving carrying a heavy object with them as they roamed that didn't have utility.

Not all hunter gatherer groups are purely nomadic, and in general they have more free time than farmers.

That decrease in free time is one way some theories tie farming to alcohol production. As substance is far more difficult when farming.

Here is a study with modern people:

https://www.cam.ac.uk/research/news/farmers-have-less-leisur...

This is not inaccurate. Play seems to have been a fundamental part of the social life of basically any human group we can discern record of. The best research we have indicates that these groups had more free time than most of us engaged in modern employment.

Is the lack of cubes evidence of utility? I mean, if they're just doing it for fun, like your daughter, wouldn't there be more that just spheroids?