This link will take you to a site that has found a permanent place in my creative self. It tells the story of a German mother of two named Emma Hauck who spent many years in a mental institution in the early 20th century. While institutionalized she wrote the phrase "Herzenschatzi komm" to her husband thousands and thousands of times. Directly translated, this phrase would read "treasure of my heart, come", but the meaning is more accurately rendered as "sweetheart come".
These letters, while incredibly sad given the story behind them, are testaments to the power of repetitive mark-making. I am fascinated by what they look like - at once simple and complex. Here's one example on the left.