A shower curtain of a very important, and well known document from your country such as the Charter of Rights and Freedoms from Canada, or Declaration of Independence from the US. If you live in a country that still recognizes the British monarch, you could also put up a photo of the king (very common in government and military buildings)

Pro tip: you can use the plastic tabs from bread bags as little wire tags

Tmux, neovim + NvChad