Door You Can’t See

Door You Can’t See

Any doorway is an empty space that means a space to walk through. But some empty space that look like doorways are really doors – and you can walk through them. What are the doors made of? Air!

An ‘air door’ is really a stream of air powerfull enough to keep out rain, drought. But it is not powerful enough to topple you ever when you walk through it.

Some busy places, such as banks and stores, have ‘air doors’ so that people can walk in and out easily, even with armloads of packages.

At night, regular doors are closed over the doorways so that no one can get it.