Long before I ever thought a lot about diagrams and art, I’ve greatly admired the work of New York artist, Rosaire Appel. In the years that I have been observing her work—mostly through social media—I have followed her explorations in a wide range of media, including video, collage, drawing, photography and especially her extraordinary artist books. I remember when I first met Rosaire in person at an art opening in New York; I believe I told her straight away that she was the most inventive artist alive (or something like that). To this day, I continue to be impressed by the quantity, scope and originality of her output. But even more, I am amazed by her overriding sense of playfulness. There seems to be nothing in her visual and sonic surround that has not or won’t soon be grist for some unexpected combination of words, notations, images, maps, marks, charts, musical scores and any number of diverse materials.