Chip Carving was an interesting find. The classic method uses a pattern of small pockets of wood which are sort of picked out in a few strokes with a scary sharp special stubby knife or long flowing cuts using your thumb as lever and stabiliser for the blade. The short stubby oval handle gives good support. The other speciality knives are then used to finish more complicated patterns like letters.
Intarsia is traditionally a mosaic of large chunks of wood that are fret sawn into smaller pieces according to a pattern, finished to differing levels and rounded edges before gluing back together again. Judy Gale Roberts is one of the founders of the craft with magnificent examples & books on this technique with classes in Tennessee. Intarsia was popular way back in 15th century Italy.