Life is about endless journey, from one road to another, from one bridge to the next, from a tunnel to the light.
"Go towards the light." That's what is said to someone who is about to leave the earthly world, in the hope of guiding them and assuring that the passage to the next realm is smooth and peaceful.
"A light at the end of the tunnel..." that's what most people hope when they go through the darkest abyss of human experience. Hopeful that it is not the light of an incoming train.
For me, tunnels are routes to take to go through a seemingly insurmountable mountain obstacle in life's journey. Dark, dank and daunting... but always exhilarating experience once you made it through.