Another Bowl / Helmet Artifact Found On Mars

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Youtube User: whatsupinthesky37 - Among this amazing shot on SOL 549 is what looks to be a flipped over Helmet or Bowl that has a lip on it and everything. This is among many out of place artifacts. Let me know what you think! Here is the picture: http://mars.jpl.nasa.gov/msl-raw-images/msss/00549/mcam/0549ML2218004000E1_DXXX.jpg