This is remarkable. Lasers were invented in 1960 as a point of reference. The painted rope on two spools was also remarkable because of its simplicity - and it

This is remarkable. Lasers were invented in 1960 as a point of reference. The painted rope on two spools was also remarkable because of its simplicity - and it holds up today on explaining what a "download" is. ;-) And even cooler - if we wanted to, I would wager a high school student could implement something along these lines using lego today. There's optical sensors, and you could rig up something to hold a pen like this [1] to render the image. [1] https://www.youtube.com/watch?app=desktop&v=dHmgaLgFRGM https://www.youtube.com/watch?app=desktop&v=dHmgaLgFRGM