Most of the joinery in furniture is invisible to the user, but ensures the quality and longevity of the piece. Sometimes the joinery can be integrated into the style of the piece by exposing some parts that are typically concealed. See examples below of exposed joinery:
Exposed dowels from drawbored tenons
Hand-cut mitered dovetails
Wedged through-tenons; commonly made with contrasting color woods to display joinery; walnut against cherry featured above
Bowtie inlay to stabilize minor split in base wood; commonly made with contrasting color woods and used as a design element
Sliding dovetail joint
Splines for miter joints; commonly made with contrasting color woods to display joinery