The light is like a spider.
It crawls over the water.
It crawls over the edges of the snow.
It crawls under your eyelids
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Well I think Mr Witt nailed it. The tattoo is like the objects in the world, it touches us but is not exactly us but it becomes a part of us. So light helps us take in the world just as a spider connects this to that as if a filament of its web connects all to us and us to all.
Great writing and it is an interesting poem.