Take a deep breath...
This site offers a quiet (with bird sounds) vista to contemplate while you take a few calming breaths. You can easily switch the scenery and background audio by selecting a different scene from the bottom right of the screen. (There's also an app that will lead you through a guided meditation if you prefer.) With a projector and some speakers, you can give your class a nature break, and even provide a setting for some creative writing.
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