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Spot the Difference: Answer to Challenge 1
The tower in the context of the rest of the image represents an example of an area with low saliency. So this tends to be difficult to spot.

The saliency map generated by the AI model of human vision shows where your eye is most likely to drawn to in red with less likely areas in blue that your eye will slide away from.
Now try our second challenge that is predicted to be easier: here.