On the Mid-Atlantic forum, wer were chatting about the tower, and somebody posted a related idea for vertical vermicomposting in a regular garden bed... not sure where they found the image, but picture a length of 6" pvc pipe with holes drilled into the bottom half for aeration and something to cap off the top... pipe gets pounded a few inches into the ground, and you dump kitchen waste and coffee ground into it... the worms access from the bottom, eat the goodies, and enrich your garden. Easier than trench composting!
The image posted had a pipe that looked to be 3-4 feet tall, and we were discussing how to disguise it when greenthumb99 pointed out that you could use several shorter pipes instead, capped off with an overturned pot.
Wider diameter pipe would probably be easier to fill from a countertop or under-sink compost bucket... I'm even envisioning using the pipe as a stand for a gazing ball or other decorative thing (not a heavy one, but hopefully having it nestle into the top of the pipe would keep it from rolling off).
