here are two recent thumbsketches from my university notes.
i think they’re both pretty convincing:
a black-and-white sketch of the colour red.
depicting the hypothetical situation “i can’t draw rove beetles.”
thumbsketches
a black-and-white sketch of the colour red.
[ squinting ] Yes, yes, I *do* believe I can see the red there. Why, of course I’ll purchase this priceless work of art for the bargain price of $1000000000000000 USD!