The design called for a half dozen individual offices to be positioned against the 12" thick, concrete block, outer wall of the building. The original plan involved cutting windows in each of the partitioned offices. When examination of the wall showed that it would be inadvisable to cut such large openings along the base of a 30' high wall, I came up with the idea to "pipe" in the light from outside.
Instead of cutting 4'x5' openings, we would instead core-drill a vertical row of 6 holes, each 2" in diameter. Solid acrylic rods with sharpened polished ends would be inserted through the openings protruding from the otherwise flat surface of the exterior, and southern-exposed wall. The sharpened ends would catch the sunlight, and act like giant fiberoptics
On the inside, a specially designed wooden light fixture (non-electrical) would support a seventh vertical acrylic rod, notched to receive the 6 that pierce the wall. The seventh rod was actually inserted within and through a series of 6 acrylic cubes. The cubes are strictly decorative, and help to mask the circular aspect of the pipes.
In order to demonstrate that the effect was possible, I built a functioning, scale model. The seventh vertical rod is missing in this case, the six hornizontal ones in the model pipe light directly into the cubes.