6 tileset = FuturisticBuilding
9 ; okay, so it's more like a spiral...
11 +------------------------------------------------------------------------------+
15 | + ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
19 | + + ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ + |
21 | + + + + + ++++++++ + + |
22 | + + + + + +++++++ +++ + + |
24 | + ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ + |
28 | ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
31 +------------------------------------------------------------------------------+