The Green Box Notes " Felt covered cardboard containing one colour plate and ninety-three paper elements"...
"In 1934 Marcel Duchamp - or more accurately his alter ego Rrose Sélavy - published in green felt covered boxes ninety-four loose notes relating to the development and function of his magnum opus The Bride Stripped Bare by her Bachelors Even, known familiarly as 'The Large Glass'...
...Source