synr: A wave and a circle are both two-dimensional projections of a helix.
tags: のーでーたんぶら,
from: http://nodatamblr.tumblr.com/post/40181190893
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tags: のーでーたんぶら,
from: http://nodatamblr.tumblr.com/post/40181190893
more here tumblr.freepornpreview.net/nodatamblr