Post-it notes (had them in a drawer already!) on black poster board on my kitchen table. Window to the left.
I didn't notice that I had missed two corners until I'd shot it (a billion times since it's Minimal rules and I wanted it to POP!), and I'd already put it all away.
Darnsies.
It's missing two blue corners.
Oh well... Here it is! :D
FYI, I exaggerated on the "billion" shots. It was "only" 87 shots to get this one. *sigh* I'm not very good at this Minimal game.