[throwaway73838]

Is that one of those cultures that had invented the wheel for a child’s toy, but not for any more practical purpose?

[prennert]

It is thought that the biggest challenge for using a wheel for serious applications was getting the axle right. This is not an issue for toys.

https://interestingengineering.com/the-history-and-evolution...

[jrootabega]

Sorry if I'm just spreading factoids and platitudes, but isn't this the point at which some people say "it's not the wheel that was the hard part; it was the axle and bearings."? So a wheel for a child's toy would almost not even be a wheel.

[shkkmo]

I think you are confused with the idea "the romans invented the steam engine but only used it as a toy" which semi-misleadingly refers to the Aeolipile.