Mayan / Aztec calendars have been attributed with predicting things like the end of the world. This one I unearthed clearly predicts the dawn of the mighty Bambu X1C.
Start with black
on layer 11 switch to dark grey
on layer 13 switch to light grey
on layer 16 switch to white
You could probably do this using just black and white, switching on the same layers. I just havent gotten round to testing yet.
Happy printing!