You spelled it right..but take it from someone who just finished 2 Bargello's..they are cut with precision..and only after stripe sets are sewn together..however..there is a stain glass style that does it..you have a choice of black stripes when you re-sew or leave it alone and call it a mosaic!!
This is a picture of 2 of mine on loan at a local coffee shop..hope this helps!
[ATTACH=CONFIG]192271[/ATTACH]