On most Kobos, the bezel surrounding the screen is raised off of the glass. This is to accommodate the infrared sensors that operate the touchscreen.
On the Kobo Aura, the touch screen is capacitive, like on a smartphone. There is no need for the bezel to be raised, so the screen is flush (on the same level) with the bezel. Or, in other words, the Kobo Aura has a flush screen.
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