Alas, the day off was not to be. In the cruel light of morning we could see some the tiles had been badly set. We spent yesterday chiseling them out and replacing them.
That was no fun. I suppose the folly of my choosing white grout was the reason. When you've got white grout and wonky shadows it looks pretty bad. Now I know why most people use a darker gray grout. It's hides all that DIY wonkiness.
Tiling is hard. I hope tilers make a lot of money because they deserve it.