(via mycrystalvision-deactivated2012)

source: http://folioline.tumblr.com/

source: queerxxxboy (deactivated20130516)

source: http://psykzz.tumblr.com/

source: http://the-work.tumblr.com/

source: http://t0tori.tumblr.com/

an introduction to reflective thinking (1921)

from the back matter of An Introduction to Reflective Thinking (1921).

 original from columbia university. digitized january 16, 2009.

source: http://theartofgooglebooks.tumblr.com/

     source: http://un-gif-dans-ta-gueule.tumblr.com/

three-dimensional geometric wave patterns caused by sound vibrations in water

source: http://bizarredisco.tumblr.com/post/58609607517/ghosts-in-the-tv-three-dimensional-geometric-wave

source: http://laukitsch.tumblr.com/