The “palette” tool comes from Archipelago by Matthijs Holter. https://www.drivethrurpg.com/product/147623/Archipelago
I actually based the palette off a simplified version of Microscope. I haven't heard of this RPG until now, but I'm not surprised that an idea this simple has been replicated elsewhere.
Absolutely. I guess Holter evolved it from other sources, too.
