Sentence:  At the same time the multiple transvestitism involved - the fat man as girl and as baby , as coquette pretending to be a baby - touches for a moment horrifyingly upon the secret sources of a life like Jacoby 's , upon the sinister dreams which <WSD>form</WSD> the sources of any human life . 
Meaning of the word marked with <WSD> tags:  to compose or represent:"This wall forms the background of the stage setting"