Tartan of the month - September: What do yo see?

[figheadair]

I see the stitched bottom edge easily enough but something else bothers me. Is it just an artifact of photography or is this piece of tartan not equal in its warp and weft setts, as it appears that there are rectangles running from bottom to top of the piece instead of squares, particularly in the yellow/faded green sections?

Here's the detail of the stiched 'bottom edge'. So tease out what you see.