It USES maple floor boards to prop up the iPad. Of course your version could be a bit different and maybe even include a channel on the bottom where the Dock Connector cable can run.

使用枫木地板来支撑iPad，你自己的版本可以做的跟图片上的不一样。

youdao

Floor mark to describe small route and narrow channel.

地面记号用来描绘小路及狭窄的通道。

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A change in height across the courtyard is highlighted by the flow of water along a channel that drops down from the planted level to the cobbled floor and then funnels into a circular pond.

庭院中的高度变化通过沿着从种植水平下降到鹅卵石地板的通道的水流强调突出，最后汇聚成一个圆形池塘。

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As Ryan winches up the lobster traps from the channel floor, Paul Cabral pulls out any lobsters large enough to harvest, and throws back the rest along with anything else that got caught in the trap - mostly crabs and starfish.

VOA: standard.2010.07.20

It was for Terry Horn, whose home in Broad Channel, an island community in Queens, was flooded with 51 inches of water on its first floor as his son scrambled upstairs with the family's dogs at the height of the storm.

WSJ: NYC post-Sandy home repair program passes 20K mark