Blackboards have been used as visual aids to teach mathematics for over two centuries, but now are being replaced by newer whiteboards. The May 2021 issue of Scientific American has a web page with an article by Clara Moskowitz titled The Art of Mathematics in Chalk. (The hard copy version on pages 66 to 75 instead is titled Chalkboard Art).
There is a series of seven striking images by Jessica Wynne titled: Isoperimetry, Mixed Gaussians, Branching Waves, Out for a Walk, Organized Chaos, Matching Shapes, and A Collaboration. The text with the image about topology (Matching Shapes) notes that a donut and coffee cup are considered to have the same shape (a single hole), as can be illustrated via an animated gif.
The image with four blackboards at the Helsinki University of Technology came from user Tungsten at Wikimedia Commons.
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