When I traveled to Gaza last week, everywhere I went, a photo haunted me. I saw it in a brochure called "Gaza will not die" that Hamas gives out to visitors at the border crossing. A poster-sized version was posted outside a makeshift memorial at the Shifa Hospital in Gaza City. And now that I am back home, the image comes to me when I look at children playing in the park, when I glance at the school across the street, when I go to sleep at night.