Petrol & Chlorine Lyrics

Lyric discussion by Greensaint 

Cover art for Petrol & Chlorine lyrics by Silverchair

This is another depressing one. I guess it's about how you're apathetic and numb, like; "why take another picture of the wall, while ur silently staring into it", sinking through deep black voids of depression, feeling that seconds, minutes, hours, days just melt together and fades away into a nothingness and your just sinking headlong down deeper and can't do nothing about it. And I like the indian instrument in the song....

Anyone know what he means with Petrol and Chlorine? Is it that Chlorine and Petrolium produces dioxins that are dangerous for the environment and causes cancer, and that brain is a pure square of grass, and therefore growing on crap and such? Does anyone know? thank you...