Goddamn islands!This was always the crux of the project. Could I make it so that all the lines were either coastlines or latitude/longitude? (Every 15 degrees, in this section.) Yes, but without the waterjet, my glass working skills would never have been up to it. And that still leaves the foiling, and the more concave a bit is, the harder it becomes. Lots of overlapping length of foil, trimmed to an even thickness with a craft blade.It's all gloriously simple, entirely convex ocean tiles from here on out, though.