Over those years, I thought back a lot to that trip to Oklahoma City and the naivete and anxiety that started this project.

Here, he asks us to think back to our great loves — realized or unrequited — and warns us that the longing never goes away.

“I’m just thinking back on all the battles. It’s been a long time,” Lynch said.

Now they are urging people who may have visited Amsterdam to think back, with a €30,000 reward to encourage witnesses to come forward.

I thought back nervously to the many night hikes I’d taken there.