If i present you with a picture of a fishing trawler, but then remove (and alternatively replace) the anchor on the bow of the trawler whenever you move your eyes, you are likely to remain unaware of the addition and removal of the anchor for quite some time. this reflects

change blindness

Explanation:

Change blindness is the perceptual phenomenon which occurs when the change is introduced in the visual stimulus and observer is not able to notice this change.

People's Poor ability of the people to the detect reflect the fundamental limitations of the human attention.

The given example in which the person is not able to notice the change which is the removal of the anchor, reflects change blindness.