Belvedere Lounge Chair. Love this Restoration Hardware look alike. Plan from http://ana-white.com/2012/02/plans/bristol-outdoor-lounge-chair but he used two 1x4's around the base instead. Like this mod! Stain is espresso with a little grey to accent for a teak like finish.
An oscillating tool works with a side-to-side movement. The oscillation is very slight (about 3 degrees) and very fast (about 20,000 strokes per minute), so it feels more like vibration. A saw blade is shown; the tool also works with scrapers and sanding pads.