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2. Do Not Erase: Mathematicians and Their Chalkboards

   en.wikipedia.org/wiki/Do_Not_Erase:...

   Writing from the point of view as a mathematician, Adhemar Bultheel calls it "a wonderful mirror" that could help other mathematicians think about what they do, while Elizaveta Dubrovina finds it to be "a nostalgic reminder of the tactility of chalk and the conviviality of in-person collaboration" in what has become a largely online world, her ...

3. Blackboard - Wikipedia

   en.wikipedia.org/wiki/Blackboard

   Uses. Reusable writing surface on which text or drawings are made. A blackboard or a chalkboard is a reusable writing surface on which text or drawings are made with sticks of calcium sulphate or calcium carbonate, known, when used for this purpose, as chalk. Blackboards were originally made of smooth, thin sheets of black or dark grey slate stone.

4. Skywriting - Wikipedia

   en.wikipedia.org/wiki/Skywriting

   Skywriting is the process of using one or more small aircraft, able to expel special smoke during flight, to fly in certain patterns that create writing readable from the ground. These messages can be advertisements, general messages of celebration or goodwill, personal messages such as a marriage proposals and birthday wishes, or acts of protest.

5. Chalkboard scraping - Wikipedia

   en.wikipedia.org/wiki/Chalkboard_scraping

   Chalkboard scraping. Scraping a chalkboard (also known as a blackboard) with one's fingernails produces a sound and feeling which most people find extremely irritating. The basis of the innate reaction to the sound has been studied in the field of psychoacoustics (the branch of psychology concerned with the perception of sound and its ...

6. Eraser - Wikipedia

   en.wikipedia.org/wiki/Eraser

   Chalk writing leaves light-colored particles weakly adhering to a dark surface (e.g., white on black, or yellow on green); it can be rubbed off with a soft material, such as a rag. Erasers for chalkboards are made, with a block of plastic or wood, much larger than an eraser for pen or pencil, with a layer of felt on one side.

7. Chalking the door - Wikipedia

   en.wikipedia.org/wiki/Chalking_the_door

   Chalking the door. Epiphany season door chalking on an apartment door in Germany. A Christmas wreath adorning a home, with the top left-hand corner of the front door chalked for Epiphany-tide and the wreath hanger bearing a placard of the archangel Gabriel. Chalking the door is a Christian Epiphanytide tradition used to bless one's home, [1 ...