They took a scan of one of his letters and made a wall mural out of it. It gives you insight into the man at this time of his life, and also makes something very small into something that a dozen people can look at.
There are a number of beautiful wall murals in the museum that compliment the exhibits. And something like 150 of his paintings. Van Gogh’s life is traced over time with examples of his work showing how he matured as an artist. Very cool.
Oh, and be sure to buy your tickets online a day in advance, you can’t buy them at the museum.