Originally posted by mike74
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You only need to remind yourself of the way a horizontal line of wet paint on a vertical surface behaves - it doesn't all whoosh down the canvas/wall at the same rate: it kinks at intervals along its length, and those regions of paint at the bottom of the kinks flow more rapidly than the rest, forming a series of more-or-less "M" shapes, or a chain of Euro symbols ( € ) turned clockwise by 90°.
The surface onto which it a liquid is sprayed will also direct the downward flow due to combinations of surface tension and the capillary effect, which conspire with the viscosity factor to produce various weird shapes. Anyone who's held a cut finger vertically will have seen, if they're observant enough, the blood forming a trail with little "cross-branches" (in the form of Ŧ's or F's) where the flow gets side-tracked into any horizontal grooves it may find in the skin.
The same would have been true, on a much larger scale, of the way the blood behaved on Mary Kelly's wall. Not that I see a particularly convincing "F" there anyway, but even if there were it wouldn't constitute anything that couldn't be explained naturally.
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