The green laser beam thus behaves like an object, blocking the blue light and casting a dark line across the screen. RELATED STORIES — Next-gen quantum computers could be powered using chip with ...

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For example, when he picked up a green apple, a part of a Starline demo we took in at last year’s I/O, parts of his fingers shimmered around it and the spaces between the apple and his hand blurred.

Specifically, the green laser drives some of the crystal’s electrons into an excited state, and when they decay, they enter a state where they absorb blue light that would otherwise pass through.

On a screen opposite the blue laser, they saw a dark line where the green laser blocked blue light leaving the crystal. This curious phenomenon arises from a property of the ruby itself.