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These independent flying yin-yang objects are stage enemies in the Touhou Project that have first appeared in Subterranean Animism. Their appearance bares the resemblance of the Yin-Yang Orbs, but they likely to have no connections with the orbs due to Reimu Hakurei destroying these things. It's a total mystery as to what these things are, what they are called or what their purpose is since no-one makes reference to them and they've only appeared in the gaming series.
These things have two outer layer rings that spin on their opposite directions with 5 spherical lights on each ring. There are four known colours to these: blue, green, red and purple. Which colour and what kind of danmaku they shoot depends on the game stage they're on and what difficulty. Also, they mostly use lasers for their danmaku.
Flying yin-yangs' Appearances
Sprite of the flying Yin-yangs without the outer ring
- Subterranean Animism
The flying yin-yangs made its début on stage 2 of Subterranean Animism, coming in fast and shooting danmaku in the Underworld. On stage 3, they were zooming in from the background and appear to support Yuugi Hoshiguma during her boss battle. They re-appeared on stage 4, coming down in queues and again in stage 5.
- Undefined Fantastic Object
The flying yin-yangs make a re-appearance in Undefined Fantastic Object, which can be said that it fits well to have these in this game since it is UFO-themed and that these flying creatures do resemble unknown flying objects. On stage 2, they'll appear from a mist and shoot large danmaku at the heroine while homing on them. They were shown to appear in Makai on stage 5, creating a sort of obstacle for the player to dodge.
- Ten Desires / Double Dealing Character
The flying yin-yangs again make an appearance in Ten Desires and Double Dealing Character, performing the same way as it did in the previous games.
- Legacy of Lunatic Kingdom
The flying yin-yangs make a return in Legacy of Lunatic Kingdom on Stage 3 in the Dream World as stage enemies. Although they shouldn't able to access this place physically, ZUN does state in the music comments that these are "just things in each dream," but are still mischievous of them to spread barrages of danmaku despite being in a dream. They're primarily the only stage enemy on Stage 4 at the Lunar Capital, and Sagume Kishin, the midboss and boss of the stage, over-uses them both using spell cards and non-spell cards.
- Hidden Star in Four Seasons
The flying yin-yangs appear as enemies in Hidden Star in Four Seasons on Stages 1, 5, 6, and the Extra stage. They're the main stage enemies of both the final and Extra stage, and in the Extra stage Okina Matara, Mai Teireida, and Satono Nishida all use these flying yin-yangs in their spell cards.
- Wily Beast and Weakest Creature
The flying yin-yangs are stage enemies in Wily Beast and Weakest Creature on the 4th, 6th, and Extra stages. They are the main enemies in the final stage, but none of the characters use flying yin-yangs in their attacks.
- Unconnected Marketeers
The flying yin-yangs appear as stage enemies in Unconnected Marketeers on the 1st, 2nd, 3rd, 4th, 5th, and Extra stages. A large, transparent, and invulnerable flying yin-yang appears as Stage 4's midboss. No character uses flying yin-yangs in their attacks.
Flying yin-yangs in the spell card Orb Sign "Disorderly Flock's Curse"
Flying yin-yangs in the spell card Orb Sign "Impure Body Detection Mines"
Flying yin-yangs in the spell card Orb Sign "Shotgun Coronation of the Gods"
Flying yin-yangs in the spell card Drum Dance "Powerful Cheers"
Flying yin-yangs in the spell card Mad Dance "Crazy Backup Dance"
Flying yin-yangs in the spell card Secret Ceremony "Rear Shots of Betrayal"
Flying yin-yangs in the spell card Secret Ceremony "Performers Unattached to Society"