Water Towers
I found this tower while driving around Vancover Washington.
This has first floor with strait legs, sloped sides for 2-3 stories and
straigt sides on the top. It is covered with horizontal wood
siding
at the lower lever, asphalt shingles for the sloped stores and
horizontal
siding at the top. This is somehwat simialar to the vertical leg
sloped towers at: http://www.Water-Towers.com/wtrsvlegslopedtop.htm
It demonstrates the many combinations and options possible in designing
towers.