The odd one out

Challenge #1 in the Visual versus Frontal Cortex series. Hosted by Xscream.
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Find something repetitive, with one exception. For example a lot of apples with one pear, orange flowers with just one yellow one in between, or some young people with one old person in their middle.
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One Open Door
by BMVH
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The "Sapphire Princess" cruise ship, docked and taking on passengers. I noticed that in this whole bank of rooms, only one door had been opened as of yet.
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Submitted: Monday, 25th January, 2010 09:27 (GMT)
Taken: Saturday, 23rd January, 2010
Focal length: 30.5 mm
Shutter speed: 1/160 sec
Aperture: F4.5
ISO: 80
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Views: 799
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