All hand-knotted rugs have a dark side and a light side. Sometimes it's so subtle it's hard to see. Other times it's hard not to see.
People have created decorative patterns since time began. Perhaps a visual rendering of a pattern rhythms brings harmony to the mind like music does with sound.
In spite of the availability of tens of thousands of hand-knotted rugs, designers and their clients sometimes require a custom designed rug. The reasons are varied.
Polyurethane is a protective coating that covers and seals the wooden floor underneath. It imparts a shiny, gymnasium-like floor. It can and does look great.