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I go up and down a lot. Maybe Ive always been like that. Partly what happens though is I get filled with energy and joy and I begin lots of things or think about what I want to do and get all breathless with excitement and then quite suddenly either through tiredness or a disappointment or something more mysterious the energy vanishes, leaving me harassed, swamped, distraught, frightened by the very things I thought I was so eager for! I'm sure this is quite classic.

- from a letter by Diane Arbus to Carlotta Marshall Nov 1968