To work charts start at bottom right. Work first, and all odd rows to the left knitting colors as corresponding to chart.

If working in the round, all even rows are also worked right to left.

If working flat, all even rows are going to be worked on the back side of your work, and therefore will be read from left to right and all stitches purled.

Because it is difficult to change colors while purling, most color knitting is done in the round.