How to look at Stereograms

Hello!
I challenged you a couple of days ago with a question ( see the left side: voting)
Do you know how to look at Stereograms?
What is your advice on how to look at them?
How do you see it? Is it difficult for you to see the image in 3D and discover what’s behind these pattern/graphics?

Waiting for your comments.

Thank you.

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