The Frame chairs is a part of exhibition “Mortise&Tenon” in gallery Alma Mater, Sofia, Bulgaria, section of Sofia Design Week. The form of chairs inspired of traditional frame construction, like Eiffel tower. Specific sides form is base, around assembled all rest of parts, like puzzle. All section is made of 18mm beech plywood and unite without glue, nails, bolt, or something else. Manufacturing process is very simple, because almost complete only cut with CNC router.