@tsarstepan,
Here is another image of a Mecynogea lemniscata or basilica spider web and it's owner. The whole complex is quite large--1 foot or so wide--and the spider is visible under the dome. Notice the egg cases hung from the line above, the lemniscus. The horizontal line is composed of numerous strands and is very strong. When the spider is ready to abandon the web she cuts the lines below it holding it in tension, and the web springs up. She then wraps the egg cases in the old web and leaves to either build a new complex or die at the end of the season.