Erik Johansson (Sweden/Germany)

Erik Johansson is a full time photographer and retoucher from Sweden based in Berlin, Germany. He works on both personal and commissioned projects and creates sometimes street illusions. Erik creates realistic photos of impossible scenes - capturing ideas, not moments: “To me photography is just a way to collect material to realize the ideas in my mind. I get inspired by things around me in my daily life and all kinds of things I see. Although one photo can consist hundreds of layers I always want it to look like it could have been captured. Every new project is a new challenge and my goal is to realize it as realistic as possible.” Erik has been invited to speak at the TED conference in London on how something can look real but at the same time be impossible.

© All images courtesy the artist

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Watermelon snow, also called snow algae, red snow, or blood snow, is

Chlamydomonas nivalis, a species of green algae containing a secondary red carotenoid pigment in addition to chlorophyll. This phenomenon is especially common during the summer months in the Sierra Nevada of California where snow has lingered from winter storms, mainly at altitudes of 10,000 to 12,000 feet. Compressing the snow with your boot leaves a distinct footprint the color of watermelon pulp. The snow even has a fresh watermelon scent.Photo credit: © Michal Renee

(Source: malformalady)

… Y’see, now, y’see, I’m looking at this, thinking, squares fit together better than circles, so, say, if you wanted a box of donuts, a full box, you could probably fit more square donuts in than circle donuts if the circumference of the circle touched the each of the corners of the square donut.

So you might end up with more donuts.

But then I also think… Does the square or round donut have a greater donut volume? Is the number of donuts better than the entire donut mass as a whole?

Hrm.

HRM.

A round donut with radius R

_{1}occupies the same space as a square donut with side 2R_{1}. If the center circle of a round donut has a radius R_{2}and the hole of a square donut has a side 2R_{2}, then the area of a round donut is πR_{1}^{2}- πr_{2}^{2}. The area of a square donut would be then 4R_{1}^{2}- 4R_{2}^{2}. This doesn’t say much, but in general and throwing numbers, a full box of square donuts has more donut per donut than a full box of round donuts.

The interesting thing is knowing exactly how much more donut per donut we have. Assuming first a small center hole (R_{2}= R_{1}/4) and replacing in the proper expressions, we have a 27,6% more donut in the square one (Round: 15πR_{1}^{2}/16 ≃ 2,94R_{1}^{2}, square: 15R_{1}^{2}/4 = 3,75R_{1}^{2}). Now, assuming a large center hole (R_{2}= 3R_{1}/4) we have a 27,7% more donut in the square one (Round: 7πR_{1}^{2}/16 ≃ 1,37R_{1}^{2}, square: 7R_{1}^{2}/4 = 1,75R_{1}^{2}). This tells us that, approximately, we’ll have a 27% bigger donut if it’s square than if it’s round.

tl;dr: Square donuts have a 27% more donut per donut in the same space as a round one.Thank you donut side of Tumblr.

(Source: nimstrz)