Acoustic Guitars and Humidity changes?

Years ago when I couldn't even spell humidity or have a clue what it was in my room, my Alhambra (all wood) hung on the wall. It would suck in just in front of the bridge like a cereal bowl and sometimes the back would swell like a beer belly. I sold it 'cause I thought something was wrong with it. It turned out I was a knucklehead. It never showed any changes with my Aria, but it was and is laminate. I have learned my lesson.