I found this design on Behance.com. Apparently this thing was design by Matt Pauk.

“Slot is a dynamic furniture piece. The sofa system finds new value and diverse functionality by blending the sofa, coffee table, and ottoman. It utilizes the common constructional gaps found between the cushions of the sofa by converting them into tracks for which the table can slide in and out. When slotted, the table acts as a console. When freed, it acts as a coffee table. The magnetically retained sofa cushions always find and keep their optimal position either atop the table for an ottoman or below for a coffee table. Slot features traditional construction with textile upholstery and finished bent plywood,” according to Behance.