2πr

Dec 11

(via http://blog.yimmyayo.com/image/37181326863)

Oct 14

Feb 29

Feb 06

Jan 31

Jan 04

(via Giuseppe Randazzos | iGNANT)

Dec 29

adventures-of-the-blackgang:

Mariner’s compass circa 1750

National Maritime Museum, Greenwich, London

(via unnaturalist)