An apparition?

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Stare at the blue dots

Stare at the blue dots while you count slowly to 30.

Then close your eyes and tilt your head back. A circle of light will slowly appear. Keep looking at it. What do you see?

Try this again, but look at a white wall after 30 seconds. Do you still see it?

Most people see an ‘apparition’ of a man – perhaps Jesus.

When you look at a white wall, the image appears much bigger.

Staring at the bright white areas of the picture tires out some of the light-sensitive detectors in your retina (at the back of your eye).

When you then closed your eyes - or looked at a white wall - you see a negative after-image.

The areas that were white now look black.