The work in Chelsea shows Mr. Sandback settling into a larger format and a singular medium, acrylic yarn.

Where were the ugly acrylic yarns?

A pound of acrylic yarn died in a dark color costs $2.75, he said.

I recently used pattern 1235 Tech 183 to knit a single motif using a wool and acrylic main yarn and a shiny contrast yarn.

His most characteristic works were composed of store-bought acrylic yarns in various colors, which he would stretch between different points on the walls, ceilings and floors of exhibition spaces.

"Broken Line" consists of a length of acrylic yarn pegged to the wall at roughly 15 degrees from the vertical.

Soon he moved from elastic cord to acrylic yarn, which allowed him to explore color and span greater distances, achieving a desired unboundedness through the use of boundaries alone.

Though he employed metal wire and elastic cord early in his career, the artist soon dispensed with mass and weight by using acrylic yarn.

What Mr. Sandback was looking for, it seems, was a technique that offered a slightly fuzzy, textured line akin to the acrylic yarn he used to construct his sculptures.

All the soft toys call for readily available, washable acrylic yarn.