Invisible but reflected?

I’m messing around a bit with reflections on a humanoid model, and have found an effect I really like. However, as it is at the moment, I’m using a reflective box to create the effect, and I’d like to hide the box from view, but keep the reflections of it on the human model.

Is that possible?

Attached is an image showing how to do it. The reflecting plane is on layer 1, the reflected cube is on layer 2, and the lamp is on both layers. Notice the circled settings in the Render Layers panel …

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Yay, thank you!