So, as round & circular / spheres (objects or symbols) have evolved in meaning since ancient times (long before pyramids), please see for yourself in these links of personal reference to this project, such thoughts as: 'through eyes of round, we seek / find our ring of perpetual love', 'halo's of the holy', 'Olympic rings', 
or simply 'bubble beauty'. This 1st link quoting Native American 'Black Elk', a Lakota Sioux, coincides with Wire's '154' very nicely:

http://www.vcircle.com/elders/archive/8.shtml
http://www.jjnet.com/emerson/circles.htm
http://www.perseus.tufts.edu/GreekScience/Students/Chris/TIME2.html
http://www.ohio.net/~ksquared/rhythms/articles/intro.htm
http://www.go2net.com/useless/useless/pi.html
http://www.bartleby.com/81/4383.html

Here is the last link's parent with circle entered already; enter any other desired quandary in search field while you are there:

http://www.bartleby.com/cgi-bin/texis/webinator/sitesearch/?db=db&query=circle&submit=Submit
~
Here's some additional links to inspire brainwaves in 3-D:

http://www.homepages.go.com/~pixlfuxa/stairs_z.jpg
http://nav.webring.yahoo.com/hub?ring=3d

You may also enter after 'ring=': 2eyes, amapi, 3dportring, 7856, or visualnet if such is your desired pursuit. 

Also, there is 

http://www.3dcafe.com

to poke around in.

And to go full circle / it's beginning to and back again:

http://www.geocities.com/athens/acropolis/1384/native.htm 

DavOzag