The “Walker Effect,” also known as the “Broken Escalator Phenomenon,” is the peculiar brief sensation of imbalance when stepping onto an unmoving escalator, despite knowing that it will not move under one’s feet. There is an occasional momentary hesitation that stems from an irrational unsureness about the stability and support of the process of moving forward.

The two strongest elements of the photograph are the plane and the building. Both aviation and architecture are two of humankind’s greatest accomplishments—incredible feats of structural engineering. And yet, what are among the first thoughts that come to mind when imaging a soaring commercial airliner and a steel skyscraper?

There is a fleeting hesitancy now, in moving forward. Even though it only ever lasts for a moment.