Has inspired me (maybe) to start writing letters myself again; highlights both the text and the materiality of letters - the latter by reproducing the original, handwritten or typed or even inscribed into clay wherever possible. My favourite perhaps the one from the NASA person responding to a nun's question about how the expenditure on space exploration can be justified in a world of famine and want. Littered with little insights into what it is to be human and how we relate to each other on both an individual and a historical scale, as well as into a wide range of social, historical and cultural happenings large and small. (Started life on the web.)
