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Here's the "head" of Curiosity. The rover's Mastcam includes two cameras (the squares below the white top), one with a zoom lens and the other with a wide-angle lens. NASA had experimented with a last minute change to give it two zoom cameras with 3D capability but the cameras weren't quite ready to take over from the existing ones.
The circle in the white box is the laser sensor which can "zap" a rock about 23 feet away and then determine its composition based on the spark it gives off.