| 摘要 |
A built structure having an upward facing surface; the built structure supporting a first image and a second image; the upward facing surface overlaid by the first image in the form of first indicia; the first image arranged for visibility from overflying craft; and wherein revenue is derived from the upward facing surface; and wherein the revenue is a function of a cone of legibility; the cone describing an inverted conical section of a sphere whose generator is equal to the distance of resolution of the smallest discrete detail of the image; the second image in the form of a substantially vertically oriented sign having second indicia thereon adapted for viewing from ground level and for which separate signage rights can be negotiated; the upwardly facing surface mechanically associated with both the first image and the second image.
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