The foresight belongs entirely to @CAE-ID in tiny (day 22).
(I didn’t join in till after you as much as admitted that CAE-ID was right. 
)
But also, earlier, there was this excerpt from Prompt #6 Gross :
Perhaps you’ve noticed the theme of dualities in the prompts this year. If so, you might have seen this coming: the next prompt is Gross!
Thanks for all the prompting and blender-fun!