Promotional poster for the useR! 2026 Conference in Warsaw, taking place July 6th–9th, 2026, at the Warsaw School of Economics and online.The left side of the image features a black background with the conference title and details in white. Below the text is a $2 \times 2$ grid of colorful squares—blue, yellow, orange, and purple—each showing a progressively more complex iteration of a black fractal pattern (Sierpinski carpet).The right side features a portrait of Keynote Speaker Peter Dalgaard, a man with grey hair and a goatee, wearing a dark blue button-down shirt and jeans. The text "Keynote Speaker Peter Dalgaard" is displayed in white text above his head.