This is "Titanium Anodizing". It's a dye-free process which uses electricity and oxygen to increase the layer of oxide on the metal part. Different colors correspond with different applied voltages. The process is creating titanium oxide in varying thicknesses which creates varying colors.

https://redd.it/1c7w6fy
@r_interestingasfuck

Oak in the Summer

#projectionmapping on a tree in the summer

Philipp Frank is an artist renowned for his light installations and visual works. He merges art, technology, and architecture to create immersive experiences. His projects are often marked by their scale and interaction with the environment.⁠