Comment 7 for bug 898129

>Also, the pluses in your image are subtle and hard to miss.
Well, mine were only to illustrate the idea. Naturally, someone would have to actually draw some proper, goodlooking pluses.

>what about buildings that can be enhanced twice.

Yes, I forgot all about them. What is the strategy here for #3, btw? Circle/ring1/ring2, then both rings, then only outer ring (going from closest to furthest away)?