Where is this?! Looks psychedelically freaky. :)

It's where you go if you drink an Essence of Purple

Le Voyage Violet. Drink an Essence of Purple, give it a minute or two and pop. You can jump endlessly to pick up Quoins. It's great for boosting your mood and energy, too, because of all the Quoins, and the Scion of Purple will move around and say stuff.