Yeah, that’s fair. Still curved though. In my defense I had it right in my brain, the idea got garbled on its way to the keyboard

Aaaaactchhhually a frozen lake would follow the local curvature of the earth, even assuming ideal conditions and crystal formation and so on

Not to spoil the party, but this would have worked with a gas car and an inverter right? Although for sure it’s much more convenient to have the feature built-in and not need to get any extra kit