'Obstacle' consists of 8 letters. It's not a long word, but it's actually hazardous. Have you ever thought that an-8-letter-word can affect a life of someone even a whole life?
Obstacle is such a disgusting and harassing thing (Lenka says "Trouble is a Friend"), and it can push you down somehow so hard that you think you'll never be able to get up and throw it away. The obstacle seems to be a Berlin Wall that separates Western German and Eastern German. Or the obstacle can be described as a long line of traffic jam that makes you hard to get through your way and you cannot go to your destination. You may press the klaxon but it will not always work at all. For me, obstacle is described as a monster following you behind and can appear anytime you cannot predict.
Obstacle also seems to be clouds, clouds that cover the light blue sky and sun to shine. You may think that the clouds are above and the sun will not shine so you'll just let the clouds stay above you and they may drop the rain sometimes. So why don't you just try to fly against the clouds like the airplanes do so you'll see what's over the clouds. Obstacles are stones blocking your way home, and why don't you just throw or move the stones away that you'll see the road ahead you leading you home?
Just fly, through the sky and you'll see the silver linings..