Did some one mention recumbent?
you might want to head over to www.bentrideronline.com and ask away.
That being said , bent trikes come in two different varieties Tadpoles (two wheels in front, drive wheel in back) and Delta (one wheel in front) Most are tadpoles, but there are some deltas besides the lightfoot (Sun, hase, and The Greenspeed Anura).
As momon bike allued to , tadpoles sit lower than even a recumbent bike. I remember being out at bentup having my bike serviced, and Dana gave me a catrike to play with to occupy my time. I thought I wasn't going to be able to get out of the seat;)
Ps. the other trike I know of that people like is TerraTrike