This is Xsixel running xeyes inside wezterm
Extract xorg_x86-64_release1.tgz to /xorg
Start with: /xorg/startx.sh
which will tell you how to run apps like DISPLAY=:1 xeyes
Use src/xserver-SIXEL/build-xsixel.sh to build from sources into /xorg
Make cosmopolitan binaries for a multiplatform Xsixel running inside multiplatforms terminals like Alacritty
Hayaki Saito did most of the work on xserver-SIXEL in 2014 which was based on @pelya's Xsdl kdrive server