Because these surfaces are 2-dimensional, they can form much more complex knots than strings in 3-dimensional space can.

It's a complex knot, but there's no knot without an end somewhere.

Mark peered into a complex knot of light at what looked like one of the star's magnetic poles.

He immediately tied himself into an intricately complex knot and became very cooperative.

I had to assume that those complex knots of equipment were weapons.

She explored the complex knot of equipment that was the center of her world.

It is a small piece of scarlet ribbon tied in a complex knot.

The thing, in no time at all, untied the complex bucket-hoist knot!

Taking a deep breath, she untied the complex knot and the bundle fell open.

Her lips moving, she tied a complex knot in the thread.