My headset, courtesy our friends at Greenbot, is from Unofficial Cardboard, and has a magnetic button on the side you can press to select a demo from the menu. (The menu is navigated by tilting the headset with the phone inside.) Going back to the menu is proving to be a challenge, and part of the problem might be that my headset doesn't have a QR code for pairing to the Google Cardboard app. But I was able to pair it anyway by opening the menu, selecting Sync with Google Cardboard, and pressing the magnetic button. Just be ready to force-quit the app if you get stuck, and be sure you're sitting down! I wound up feeling motion sick after just a few minutes, but hopefully your mileage will vary.
Google announced today that Cardboard is part of Google's new Expeditions kit, aimed at teachers, who can control the experience from a tablet while the students use synced-up smartphones inside Google Cardboard to take a virtual tour of the ocean, the Great Wall of China, or even the moon.
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