There's traffic, but no cars.
There's a floor, but no ground.
There's an apple, but no fruit.
It's quite simple, really. Just prove to me you can pass through the green glass door.
This is a riddle. Don't post rubbish like 'this is stupid' or I'll add you to my list of fags. Also, don't post the same thing as someone else. Don't reveal the secret either, I enjoy watching people struggle to understand what's going on.
Those Who Passed
Those Who Failed