[zippyt]

That's cool, Zip. In the picture above, it looks like the stack of blocks are being held down to the channel on the floor by three tie rods with plates and nuts on top. Yet the rods don't show a shadow because the optical fibers bypass the rods. That means anything like reinforcement or utilities, within reason, could be embedded in the wall without being shown in shadow.

I would think that if the fiber was wraped AROUND the conduit or structural member then it wouldn't show as a shadow .

Alsothink about the fun that could be had with multi color leds , whole pannels of them , you could have a company logo scroll up or down a sky scraper , or at Xmas you could have all kinds of designes like sants flying from building to building in a big city !!
Oh and you could have a building that the burgler or fire alarm was going off flash red !!! that would make it easyer for cops to find it .