PORTLAND, Maine (AP) -- Three mysterious structures that appeared on the water in California and Maine have the tech world abuzz.

Each of the boxy structures sits atop a barge and looks like a four-story building made up of metal boxes. Little is known about them, but they appear to have been registered by someone familiar with geek speak -- and with a sense of humor.

The structures are registered with a Delaware corporation as BAL0001, BAL0010, BAL0011 and BAL0100. In binary code used in computing, the numbers spell out "one," ''two," ''three" and "four." Currently, Nos. 1 and 2 are on the water in San Francisco and No. 3 is in Portland Harbor.

Online speculation has focused on Google, which has a patent for a floating data center that uses ocean water for cooling. Neither Google nor the company outfitting the vessel shed any light on the matter Tuesday.

Sharon Gaudin, a writer for Computerworld, told the Portland Press Herald that the way the vessels were named suggested a technology origin or use.

"That's a little telling," she said.

Also, the Delaware company to which they're registered is called Buy and Large, a likely joking reference to "Buy N Large," the fictional megacorporation in the 2008 film "WALL-E."

While the floating structures may one day have a high-tech purpose, their construction appears to be fairly low-tech. They consist of shipping containers welded together and placed atop barges.

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