Don Sahlin (1928–1978) was Jim Henson’s principal designer and builder through the 1960s and 70s, and the person most responsible for what a Muppet actually looks like.

Henson said it plainly: Sahlin was the man most responsible for the look of the Muppets. Henson supplied initial sketches for many characters, but the translation from drawing to object — the part every builder struggles with — was Sahlin’s.

What he built

Rowlf the Dog in 1962, for Purina Dog Chow commercials, was the first. From there: Ernie, Bert, Cookie Monster, Grover, Oscar the Grouch, The Amazing Mumford, and the first version of Big Bird’s head, later largely rebuilt by Kermit Love.

The design principle worth stealing

Sahlin’s characters are built on a startlingly simple geometry — a rounded head, cut across by a large mouth, with features reduced to the minimum that reads. A beginner’s instinct is to add detail. Sahlin’s entire contribution was knowing what to leave out, and his faces carry more expression than far more elaborate builds because nothing competes for attention.

The Henson stitch is his

He named the technique for hiding a seam in fleece — the one that runs down the centre of Kermit’s snout. His own assessment was characteristically unromantic: it does not make a seam truly invisible, it makes it invisible enough for television.

Before Henson

he made puppets from the age of eleven, studied briefly under Rufus Rose of Howdy Doody, rebuilt puppets for Burr Tillstrom, and worked in Hollywood as a stop-motion and effects animator on George Pal’s films.

He taught

Contemporaries describe a builder who shared technique freely and launched the careers of dozens of young puppet makers. He also introduced Kermit Love to Henson.

The finale of Fraggle Rock closes, after all other credits, with a single line: this show is for Don Sahlin.