Some relevant letters between Walter Gropius and Lucia Moholy are displayed on the website "99% Invisible". Moholy stated, "These negatives are irreplaceable documents which could be extremely useful, now more than ever" to which Gropius replied, "[...]long years ago in Berlin, you gave all these negatives to me. You will imagine that these photographs are extremely useful to me and that I have continuously made use of them; so I hope you will not deprive me of them." Lucia Moholy responded, "Surely you did not expect me to delay my departure in order to draw up a formal contract stipulating date and conditions of return? No formal agreement could have carried more weight than our friendship. It is a friendship I have always relied on, and which, also, I am now invoking."