This is based in light reflection of the fiber when pile direction is changed.
Direction of carpet pile.
On stairways the pile should sweep down.
Extra hidden carpet should be folded back at the top and bottom of stairs so that as the edges of the tread are worn the carpet can be moved to hide the wear.
Orienting the tiles in the same direction will create a seamless look.
Any two carpet tiles facing in different directions will appear to be slightly different colors.
The direction of the pile is most noticeable in medium length saxony styles and is less noticeable in longer piles such as friezes when the pile is reversed in a cut pile carpet such as a saxony the light is reflected off the fibers in a different manner making the color of the carpet appear different either lighter or darker than the original color.
Carpet tiles will have arrows on the back that indicate the direction of the carpet pile.
The carpet layer has finished and at first glance it looks great.
How pile reversal looks.
The manufacturer recommends how to orient the tiles.
Saxony a saxony is a cut pile carpet in which two or more plies of yarn have been twisted and heat set so that the tip of each carpet tuft is distinguishable on the pile surface.
Generally seams should run in the same direction as most foot traffic.