I’ve started keeping a tiny blank black chalkboard on my desk, next to a stick of white chalk.
It is also known as a tablet. But I am not confused between it and the three other devices on my desk that have the same name, though it is just about the same size. This one cost about two dollars at Walmart and stays fully charged and useful forever. As long as I don’t run out of chalk. The others were substantially more expensive and need constant electrification.
There are the expressions “clean slate” or “blank slate.” Clean slate indicates that all is forgotten or forgiven, that one is starting over. Blank slate indicates thought that starts without prior or preconceived ideas.
In Latin it is tabula rasa, a clean, erased, or literally scraped tablet, based on wax writing tablets used by the Romans. Aristotle used this as a philosophical concept, as did John Locke.
I draw circles on it. I draw lines on it. It doesn’t have room for many words, just one or two, so I don’t do much writing on it. I do that on the other fancier tablets. Whatever I do chalk there, I always erase. Blank, for the next time.