Spoilers below:
The arrow points FROM a color, TO another color. if the arrow is pointing TO red, it's coming FROM white.
However, there may be a circle below/above the arrow! Remember that this means to rotate the arrow 90 degrees clockwise/counterclockwise. Rotate the arrow, then figure out what it's pointing to.
This was the first thing I truly couldn’t figure out and came looking for help (also, the in-game hints didn’t help at all. they said first to look at the arcade machine WHILE I was literally looking at it lol, and then to take a picture of the tree. I know! I was having trouble with what came next!). The first hint was just the arrow, so it looked like it just pointed to the first colour, and I kept trying to go from the bottom (white)! I tried yellow, then I tried orange ‘cause I took into consideration the circle rotating the arrow, but I didn’t think that it was going from one colour to another. This could be communicated better.
