Geotagged photos (e.g. flickr) and text (e.g. twitter) associate data to a particular point on the globe × time. In other words, a fibre bundle over S²×T.
Imagine the position future historians will be in — if they can synthesise the petabytes of digital data we generate these days. I would love to have crowd-sourced pictures or live-tweeting bystanders’ microblogs of the Yan tie lun 鹽鐵論 (81 B.C.) — Rashomon effect be damned.
Human Mathematics 