The result is either a mirror image or an upside-down image.

结果将产生一个镜像或颠倒的图像。

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Light entering the eye forms an upside-down image on the retina. The retina transforms the light into nerve signals for the brain.

光线进入眼睛，在视网膜上形成了一副倒立的画面，视网膜将光线译成神经信号，脑子识别信号并将画面倒立回来，于是我们就知道我们看到的是什么画面了。

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You can tilt the iPad any direction, even upside down, and the screen will flip to display an upright image.

你可以任意旋转iPad，甚至上下倒置，屏幕会随即调整显示正确朝上的图片。

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Some animal-lovers also argued that the image of a boy holding the frog upside down was cruel, our correspondent adds.

BBC: Venice removes Charles Ray Boy with Frog statue

On closer inspection, the machinery turns out to be a trompe-l'oeil painting and the interior a mirrored image of one built upside down behind the painting.

WSJ: Too Clever by Half | More Real? | Minneapolis Institute of Arts | By Peter Plagens