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I saw this thing yesterday on my window curtain, and I've been wondering what this is. It looks like a dense network of spider web, and the spider inside it is visible. I thought the spider was dead, but I saw the spider making very small movements inside it. So, that made me more curious to know what it is.

enter image description here

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  • $\begingroup$ This is probably made to protect eggs and young spiders, a sort of nest. $\endgroup$
    – RHA
    Commented Oct 31, 2018 at 19:02

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From the look of the spider outline, it looks to have short legs and is dark. A yellow sac spider is quite light-coloured and has long legs. Yellow sacs and clubionids will sometimes make themselves a sac for resting or eating or molting or laying eggs. Yours is probably a jumping spider, and here is a youtube timelapse video of a jumping spider laying eggs while inside its own protective sac:

https://www.youtube.com/watch?v=yoqMNX0RWuc

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