This small cat picture represents a huge step forward for Spectrum (https://spectrum-os.org).
It is a window of a graphical application running inside an unprivileged VM, seamlessly drawn on the host system’s window manager just like any other window.
This is done using virtio-wayland, a technology invented for Chrome OS. I think it has huge potential, but to my knowledge, this is the first time it has been used outside Chrome OS (it was a real pain to port).
Thanks @puckipedia for the help!