The always centric structure of a web provides the spider the highest hierarchy among her realm. In this "tourist center" --- the information hub --- our host can easily detect the coming of those bad-luck guests precisely before her accommodation.

The relationship between the forces found between mooring threads(M), frame threads(F), radii(R) in an intact web is 10:7:1. As an lab-abservertory result, this figure also explains the inner balance of the web as a structure system. The number of different kinds of strings(A=M=F=|3-5|, R=|20-40|), the angle of each section(AS=|30-60|) are all set. (source: forcesInTheSpiderOrbWeb.pdf)

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