We already know what happens when Rupert Walker and Brandon Semenuk get together: magic. The two are the brick and mortar of Revel Co., a visual workhorse taking a divergent approach to modern-day mountain-bike media. “Gallery” is no different—which means it is completely different. Watch it. Then watch it again. And after that, go through it a third time. Pause. Rewind. Play. Put on your headphones, turn up the volume, go full screen and experience “Gallery.”