People often see cosplay as just some guy/girl dressed in costume who's walking around showing off, completely ignoring how much hard work is being poured into all the preparation needed before that.
Redditor Zibartas recently shared his work on animatronic wings of Mercy, from Overwatch. He said that he has been working on them for the past nine months in his free time and now he's finally ready to show them to the world.
And we might say that the final results are amazing, some might say a mechanical piece of art. They are made of aluminium and plastic, and they glow in the dark!
Zibartas is a cosplayer in his free time, and he's primarily focused on animatronics, and special/lightning effects and their use in costumes/prop-making. You can follow his Youtube channel to find out more about the stuff he's making and the process behind them if you are interested in this kind of things.
But, for now, enjoy the video.