Two topmost towers -- one a square and the other a cone -- on top of black bucket forming shell
Carefully carving 90 degree "see through" windows -- light passes all the way through both from east to west and from north to south
Carving stairs around two topmost towers -- sailboats on Lake Michigan
More work on two topmost towers
Adding several more windows below two topmost towers
Two topmost towers -- light through "see through" window from the east
Carving stairs around two topmost towers, along with several more windows after black supporting bucket/shell has been removed
Stairs around two topmost towers curving around into a tunnel between the towers
Many more decorations around doorways and sailboats on the lake