trickoftheeye

noun
UK /ˌtrɪk əv ði ˈaɪ/
US /ˌtrɪk əv ði ˈaɪ/

Something that looks real but is just a clever fake that fools your eyes.

The magician made the coin vanish, but it was just a trick of the eye.


OTHER MEANINGS

2. A visual effect that makes you see something that is not really there.

The desert heat created a trick of the eye that looked like water.

3. A clever way of hiding or changing something so people are fooled.

The mirror on the wall was a trick of the eye that made the room seem bigger.

4. A false appearance caused by light or distance.

The faraway mountain looked tiny, but that was only a trick of the eye.