After images is a psychological topic. It states that the image which you have concentrated on for a few seconds are stored in your short term memory. From the short term memory you can recollect them by viewing it with your eyes again without the object physically present.

Yes, it’s amazing. There are two types of after images

1. Positive After Image
2. Negative After Image

This amazing fact is experienced mostly for negative after images.

Now all what you have to do is take a picture which is colourful. Stare on the picture for about 20- 30 seconds.

Now quickly keep on blinking your eyes on a white paper (keep the white paper ready before the experiment).

Amazing!

You can see the picture with complementary colours.

This is due to the negative after image phenomenon. This method can be used to recollect pictures, names etc. that was stared on.