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I spent 10 minutes staring at that picture and saw only the wife. The mother-in-law never appeared.

This happens to me often.

I had trouble at first too until I noticed the ear looking a little suspicious. If you create a diagonal obstruction from the top of the hat, to the nose, you are left will only the mother-in-law; the ear has now become an eye.

Once I'd seen it once, the mother-in-law is now prominent. I can still see the wife if I concisely choose to, but the mother-in-law is now the default, strange huh?

Thanks! That helped me finally see the mother-in-law.

I showed my wife the picture and she couldn't see either woman until I pointed out features. Interesting!

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