ALS with sketch in German, signed “A. Einstein,” one page, 8.25 x 9.25, March 22, 1947. A letter to Ruth Edith Damann, in which Einstein recalls a childhood game, in full (translated): "It was lovely of you to have thought of me on my birthday. What you sent caught me on one of my weaknesses, which is of course a truly female knack. Apart from that, I know that these little things are currently not at all easy to find. The puzzle with the marbles is a simplified version of one which did the rounds during my childhood under the name ‘Pig in the sty.' It went like this:" Einstein adds a diagram sketch, illustrating the puzzle with internal walls, the 'poke,' and the marbles, and then proceeds: "I think I drew in one too many walls; I guess it was only two. The thing with the pieced-together ball is a masterwork. I wonder who invented it. Thank you so much." In fine condition, with trimmed edges, slight fading, and a faint block of toning from prior display. A wonderfully informal letter from one of the world's greatest freethinkers, made all the more desirable by Einstein's visual reference to a game he played as a child—Damann's present was quite possibly the classic skill game Labyrinth, which was released in Sweden the year prior.Format: ALS