grid cage

https://github.com/alesanabria/hex-rgba#readme HEX to RGBA

border = user color (hex) fill = hex to rgba (.2~), behind cards

ghosting squares, like teh circle fadeout. ?newest square appears below the older ones (reverse of cicles)

rectangular selection tool, marching ants cuz system had no real transparency

Figma? Other drawing apps

Folklore draw marching ants?

box select visual?

Draw w shift mouse down on broadcasts , box from{Xy} to {xy} , Send clear box when done

Box canvas, sibling to magicpaint

Box select