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I vaguely remember reading an effect where a spectator imagines a physically impossible object which is then revealed. Does anyone know where i might have read this effect from?

thanks

From your description, the only effect that jumps out in my mind is Jamie D. Grant's "Industrial Revelation". I remember reading someone's routine where the spectator is told to imagine what would be impossible to be inside the card box ... then out pops a sold hunk of metal.

Perhaps another member might be more familiar with your description.