The genesis of the 'EinStein' aperiodic 'Spectre' tile -top right- [La génèse du pavé 'Spectre' apériodique 'EinStein' -en haut et à droite-].
See a related picture:
The discovery of the "EinStein" tiling of the plane by means of the "Spectre" monotile is due to
David Smith, Joseph Samuel Myers, Craig Kaplan and Chaim Goodmann-Strauss (05/2023).