since the image is flipped by changing the direction of the eye movement, only symetric motives can be used to avoid confusion when using the pov device in the “headshaking” stationary manner. therefore, the motives chosen should be easily understandable, they should be of a symbolic kind.
placed next to a highway and showing crosses, the POV device reminds drivers that speeding kills, the faster they drive the better they can see the crosses
the 32*32 LED code and hardware finally works… after finding out that a 2dimensional array of booleans uses all the RAM of the Atmel on my Arduino board, i was told that i could store the image data in a 32-field-Array of longs. it was a little bit tricky to figure out, but i wrote an processing sketch that outputs a series of longs to the console generated from a .gif image which can then be copied into the arduino program.
in order to draw attention to the object, it has to reveal itself shortly. this will cause an irritating moment and make people want to explore the nature of the POV display. motion of the eye is necessary for that.
tests with the prototype have shown that even the saccades of the human eye are able to enable the effect. when looking around in a room where such a display is placed, in the corner of ones vision the motive displayed suddenly appears. i hope that the larger version with 32 LEDs will be visible even better when letting a glimpse glide over it by chance.
another possibility would be to set the display up in places where people are bound to move their eyes. even better when always in one direction.
in this case it is interesting to find a content that matches the surroundings again… for example on the side of a racetrack the letters “CO²” could be shown.
the statement made by the POV devices described in the former post relies on three factors: the word or image shown by the device in relation to the place it is set up in and then the people who have to shake their heads in order to recognize the image.
here’s the old NO WAR example: only the word “war” is shown, in front of an embassy of a nation in war. people stand there facing the building, shaking their heads in order to see the words, thus negating it. this is not only a visible sign for the employees of the embassy but also an irritating moment for passers-by.
the same principle can be used in many situations to provide a subtle and critical hint in the public.
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