Private Cards in Public Spaces

Probably a bit out there and niche and something that would only be useful to me, but…

Idea would be you could flip any card in a public space to private and then the text on those cards to other people would be blurred out.

I think of my Journals as a blog almost but it’s also kind of my home space for the day and keeping work and more private things in the same space would be super useful.