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Sorry if this is obvious, but I've been away for a while and need to catch up.

Can I place an object in a Maxwell environment such that the object is invisible to the viewer, but makes its presence felt through the shadows it casts, the reflection of it in other objects, and the diffuse and specular reflections (caustics and radiosity) it throws?

Turning on Hide to camera in object properties should do what you want.

Thank you very much.