Astronomicum Caesareum (1540)

http://www.rarebookroom.org/Control/appast/index.html,
http://www.sciencemag.org/cgi/pdf_extract/158/3797/102,
http://www.atlascoelestis.com/ApianusPaginabase1.htm,
http://www.metmuseum.org/toah/works-of-art/25.17,
http://www.jstor.org/pss/301615,
http://www.loc.gov/exhibits/world/world-object.html,
http://www.heroturko.org/artbooks/68676-astronomicum-caesareum.html

http://en.wikipedia.org/wiki/Petrus_Apianus#Life_and_work,

http://www.metmuseum.org/works_of_art/collection_database/drawings_and_prints/astronomicum_caesareum_michael_ostendorfer/objectview.aspx?collID=9&OID=90004086

An 8 sided Stop_sign functions like a control valve at intersections.

An 8 sided gateway through time & space?

http://www.grahamhancock.com/news/index.php?node=17203