It has been suggested that nanotubes are strong enough to make an elevator cable to geo stationary orbit.
...........

My acoustic lens looks like a blastopore* from the outside.
*(embrionic stem cell)

http://www.angelfire.com/md2/customviolins/H.jpg.jpg

4 lens and 8 lens look relatively similar but my computer is not powerful enough to show the internal dynamics for more than 4 lens.

My ray tracing computer program seems to be indicating that there is a power drop off as more chambers are added but I had to lower internal reflectivity after 2 lens to save computing time.