Hi: in my house this insect is quite common. Apparently it likes humid places. The insect crawls up the walls and affixes to it or hanging from flat top surfaces. In the picture, what you see is the cocoon and there's a worm inside which may exit from either end of the cocoon. Maybe I could take a video of it crawling. The size of the cocoon varies in size as shown. I live in Cuernavaca, Morelos, Mexico. Many thanks for your help.