One memo to the special-effects unit began: "You cowardly bastards ran away last night without facing the music on the mask and other ancillary nightmares connected with the Jupiter shot." The other, a note to Logan, apologises for not giving him an increase in salary.
Earlier this year, the Smithsonian published a Kubrick letter from the Arthur C Clarke archive, and a Kubrick memo is currently included in an exhibition at the Museum of the Moving Image. In 2014, the BFI published several other Kubrick letters related to 2001.