Light channeling technique

https://www.youtube.com/watch?v=oBmlvIx0gkQ

https://www.youtube.com/watch?v=oEyWGeQQ6Zg

https://www.youtube.com/watch?v=sTSFrKKSt2o&t=132s

https://www.youtube.com/watch?v=2Cd9q_hivRg

https://www.youtube.com/watch?v=owINT3VLVos

https://www.youtube.com/watch?v=8lMaAFSpJB4

https://www.youtube.com/watch?v=DydmYKWVwXA

https://www.youtube.com/channel/UCr5xw3WzOAULh8Qi9-8BINQ