We have dozens of these spiders both indoors and out but I have never yet seen one walking. They hang upside down or vertically from the ceiling, window frames etc, and if disturbed spin a thread. Outside, they are on the mosquito netting and spin elaborate webs between plant leaves, the mango trees are one of its favourites. Sometimes the webs are intricate while others are just a jumble of threads.
Fully extended they are never more than a centimetre but often much smaller. I found the discarded skin of one which measured 50 millimetres.
I have not managed to track down any arachnologists in Egypt, so does anyone know at least what family it might belong to?