Could there ever be a physical representation of BTC, or any crypto for that matter? Like a banknote, but for crypto. How could this work?

With all the recent unusual solar activity, I've started to wonder what could possibly happen if the internet were to go down, or become unstable for an extended period of time - and how that would affect crypto. For example, if there were extreme amounts of solar activity over the course of a few years, to an extend we have never seen before. To me, this seems like cryptos biggest weakness right now. And, this got me thinking about a physical version of BTC.

Could there ever possibly exist a physical version of crypto? Similar to a banknote, but with a QR code or something printed on it to link it back to the blockchain. Or would it have to be some sort of smart device embedded with RFID or something along those lines? If so, who would be able to issue these items, and how could they be redeemed?

I understand that the world would have a lot of other problems if the internet were to go down, but this is just a hypothetical situation that I've been thinking about. Does anyone else every think about this scenario? Curious to hear some other peoples opinions on this.