Is this a safe door? That is a very good question regarding this particular vault. The door seems a little strange First look at the top, the door is opening out - right? Well now look down the bottom!!! It is opening into the vault. How can it be opening in and out at the same time.
The only good thing is that any burglars would not know how to open this 'Safe Door'
You may also remember a similar deception type illusion called the Clifton Bridge Illusion