“

How do we tell if a window is open?

Just throw a stone at it.

Does it make a noise?

It doesn’t?

Well, it was open.

Now let’s try another..

CRASH!

It wasn’t!

”

*Source: Where the Sidewalk ends by Shel Silverstein

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Not only can you tell if the window is open or not, you have successfully got both the windows opened.

All you’ve got to do is throw a stone. All you’ve got to do is START trying.