Image source. (This one is not a spoiler.)
This puzzle isn't strictly science-related, though there is a mathematical fascination with this topic. I don't want to give anything else away, so all I'll say is this: it's a puzzle within a puzzle, about another puzzle.
Bad news: there's no online version this week.
Good news: that means an extra interesting theme...
PDF:
cubism
.pdf
Download PDF • 251KB
Answer key:
cubism-answers
.pdf
Download PDF • 227KB