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Cans of spray paint with two nozzles, slightly offset from each
other, one spraying red paint, one blue. The paint would have
be quick drying and semi-translucent. If the graffitist keeps
hand level, then the end result would be two identical,
overlapping images, in red and blue
respectively. To the
unititiated, the graffiti tags would make no sense, but
"in the know" could wear their stylish 3-D glasses at all times;
enjoy the illusion of seeing three-dimensional drawings float all
them, as they walk down the street.
[jaksplat, Oct 16 2009]
4 in 1
[po, Oct 16 2009]
||//slightly offset from each other// - this would not give a 3D impression. At the very best, if the colors where somehow mutually translucent (something i do not see happening), the graffiti would seem to be on a plane parallel to the wall, either in or out, but in the picture itself, everything would be co-planar. You'd need to be able to vary the distance for that (possibly not impossible, Dalí is said to have done some 3D painting free-hand (though i doubt it, probably was using a viewer at the time of painting))
||Yesss! This is a brilliant idea!! To get 3-D, all you would
need is to have the two nozzles separated by a small
distance and angled *away* from eachother. Then, you can
control the apparent depth of the 3D image by moving
your hand closer to, or further from, the wall.
||With your hand far away from the wall (ie, close to
yourself), the two colours will be widely separated, giving
the stereoscopic illusion of being close to you (ie, in the
foreground). With your hand closer to the wall (further
from yourself), the two colours will be closer together (or
superimposed), giving the illusion of being further away.
||In other words, the apparent depth of the image would
reflect your hand position in 3D. This is an excellent idea!
[+], and would that I had more buns to give.
||Trouble is I think graffiti artists control the fineness of their line by varying the distance from the wall - close is sharp, far is fuzzy. Perhaps a 2-handed thing with a lazy-tong style linkage that intuitively adjusts the seperation?
||To address the sharpness issue, the nozzles could be fitted with widgets similar to those you find on the end of a garden hose, which allow you to adjust the output between a single, straight stream and a finely diffused mist.
||... and do so automatically to compensate for the nozzle's distance from the wall in spray direction, as measured by a built-in infrared laser distance measure.
||That's far too technical a solution. Good idea.