In this video, I show you how to do some simple intarsia (a type of colourwork), that lets you do wide, vertical sections of colour (it is also used to make large and/or filled in colour work designs).

Tl;dw: when you change colour, twist the working yarns together by passing the new colour under the old colour.

I chose colours to look like the flag of France, but you can easily change colours to do any vertical tricolour flag or just your favourite colours!