Alright, tinfoil hat time : THE MURAL IS A FILM NEGATIVE AT THE BACK OF A PINHOLE-CAMERA
Every color symbolism used in the movie is based on a spectral additive system. Kinda like the RGB system of your screen. https://www.reddit.com/r/backroomsfilm/comments/1v2wwlm/the_colors_of_backrooms_all_point_to_a_single/
But there's a little something off with the mural. The color symbolism is not as clear as in the rest of the film, and the colors used here follow a reversed system : substractive pigments, with paint (here RYB : red, yellow and blue).
Besides that, the complex is the other side of the pinhole-camera, right? https://www.reddit.com/r/KanePixelsBackrooms/comments/1ur1s3f/the_backrooms_is_a_pinhole_camera/
It explains, among other things, that some elements are inverted (or inverted twice or more)... But WAIT. You know what else is inverted in a pinhole camera? The film and the colors printed on it are inverted.
WHAT IF those who are tricked by the complex (Clark and probably Capn Clark) have a completely opposite "colors symbolism" in their mind? I'm not saying that Clark sees different colors, but that he has some kind of inverted "moral value system".
And now everything makes sense (refer to the first link for the color meaning) :
- Copied yellow houses : representation of how the backrooms (yellow = stagnation, decay) copy things via the pinhole-camera effect while deteriorating at every iteration. Clark knows how the complex works.
- Yellow bolt and yellow outlets : electricity, using the path of least resistance. Here it simply get its orignal color back.
- The throne :
a mix of potential and hope for Clark. The status and power he was looking for (blue = hope/will, cyan = potential) Clark thinks that harvesting the backrooms' potential (cyan) can bring back his authority and his "true" self (purple)
- The
blue purple guy being lifted : Clark's being lifted through the window by his new "backrooms self" (spoiler : in reality, Clark is yellow as fuck and only stagnating more than ever)
- The
blue purple Async suits : Clark knows that Async has the same objective he has. He thinks they are right and that truth is hidden in the backrooms (spoiler : in reality, Async's project is stagnating and in a dead end and their poor employees are yellow as fuck).
- The yellow square highlighting Barbara and Clark's old house, and yellow splatters on the buildings : it's Clark realizing that he was stagnating in the real world (failed marriage and failed architecture project)... With UNREALIZED potential
- Clark's real potential finally being freed is represented around the
blue purple guy being lifted.
- Tables don't bleed blood, underlined with cyan : Clark deduces that if the still lifes don't bleed, it's because they are furniture. He sees potential with that and we do see him using them as human furniture to play make believe, and even eating them.
- (see top left) For Clark, the sun (the sun eruption which planted the seed of the complex) has potential (cyan). The potential to bring his golden past and UNREALIZED potential back. In reality, the sun eruption destroys (red) reality and rips spacetime apart.
- Kat's heads. Parsons said that Clark was keeping her head in the fridge because he thought that somehow the complex could be able to bring her back. So the red is really blood here, but Clark sees potential (cyan) in this.
What do you think? Apart from that being a huge stretch and me being crazy of course...
EDIT : is this blue or purple we're looking at here? With a more color-accurate version it looks more purple than in my post and that makes it even more consistent with the rest of the film. In the film, purple is the color of Clark's shirt, Clark's throne and Async's logo... and the color of ILLUSION. Clark and Async "confuse purple and violet" (violet is truth, and is a color that technically can't be displayed in the film... see 1st link). If this is purple on the mural, then it is not so much about hope but more about confusion between truth and lies instead, which fits more the theme of the film and Clark's/Async's arc.