A door is the first welcome you receive when you arrive, the first greeting, the first smile.
This door is a portal. Open it and you are transported into a messy place, a dusty place, a place where progress is made in what seems like leaps and bounds. Open it and you are transported into a welcoming place, a loving place, a place full of hope and excitement, pregnant with expectation and dreams of grandeur.
Knock on this door and it will probably open. Try to kick open this door and you will likely end up with a sore foot and a criminal record.
Why don't you try knocking?