Stack by Konstantin Achkov - Muebles por encastre.

Product designer Konstantin Achkov has created a range of flat-pack furniture that slots together like a puzzle.

Called Stack, the pieces are assembled without glue, screws or other fixings.

The collection so far includes a round table, bar stool, chair and armchair.

Each one is made of 18mm-thick beech plywood, cut with a computer-controlled router.

The pieces were presented at Sofia Design Week from 1 to 8 June.

A graduate of Sofia University, Achkov plans to launch his own brand calledTenon to produce this range and his previous work.