Comment by taviso

It's fun, but reminds me of a trick using Xvfb.

For example...

    $ Xvfb :7 &
    [1] 21688
    $ xeyes -display :7 &
    [2] 21697
    $ xwd -display :7 -name xeyes -out /dev/stdout | convert xwd:- sixel:-

It looks like this: https://imgur.com/a/Eq2ToVO

Obviously no input though, you would have to use xdotool! The main benefit is that you probably already have all these tools installed :)