Original "yellow brick halfplane" discussion?

Thanks for asking! Here’s the background:

It is, shamefully, still not done!

But I should also say that as a new user you should definitely not be worried about all that. Your intuition is correct that the yellow brick road is already conceptually a yellow brick half-plane in that it’s fine to either be on the road or on the good side of the road (above the road for typical do-more style goals).