Are ultra high racers available commercially? In the Hessian woods today I saw a recumbent where the rider was positioned very high; his entire body was higher than any of the wheels.  In this position, he was at least as visible as an rider on an upright bicycle, and more visible that one on a ducking bicycle.  Is such an "ultra high racer" (as opposed to ordinary high racer or low racer) available commercially or may I have been witnessing a custom built / modified bike?

Unfortunately I didn't manage to take a picture, recumbent cyclists are fast :-)
This is a low racer:

The frame goes lower than the wheel's axles, and as a result the rider's shoulders are somewhere near even with the top of the wheel.  In extreme cases, the rider's head looks to almost rest on the back tyre.  It can be very hard to see forward from these positions, but its the most aero.

This is a high racer:

The lowest part on the frame is above the wheel's axle line.  Rider has a better view forward, but has a higher frontal area to catch the wind.

I'm not aware of anything higher than the high racer design.