Inspired by @davidbisset, here's my nod to some important changes in the WordPress themes.
2003 - WordPress started, with Classic theme
2005 - Kubrick (Default) and the WordPress theme repository
2010 - Twenty Ten, first of the yearly series
2011 - Twenty Eleven, first responsive core theme
2012 - Theme Customizer support
2019 - Twenty Nineteen, first block-based core theme
2022 - Twenty Twenty, first full site editing core theme
