natgeofound:

Alexander Graham Bell and Mabel kissing within a tetrahedral kite, October 1903.
Photograph courtesy Library of Congress

(Source: americandeadstock, via sattvah)

(via k4nt)

theamericankid:

The knight can visit each square on a chess board exactly once

(via oxane)

oxane:

cavodotti by mluisa_

…naturalmente sempre lo stesso negozio di materiali per l’edilizia…

(Source: pynter, via visualacuity)

(Source: hrsst, via visualacuity)

shrbr:

blcns by zelnunes on Flickr.

(via visualacuity)

raphael1891:

Pont du Bosphore #01

(Source: mrharristweed)