Charles and Ray Eames took play seriously, and their most successful toy was a set of colorful cards that could be built into three-dimensional structures. The sets, created in 1952, are still being made and are available in small, medium and large sizes.
Charles Eames with House of Cards miniaturechairman.com
Alexander Calder is best known for his mobiles, but he also designed as many as 1800 pieces of jewelry for his family and friends. When he was a child, he started making jewelry for his sister's dolls, using wire he found in the streets. By the late 1930s and 1940s, he was creating jewelry reminiscent of his sculptures in form and movement.
Calder made no effort to mass produce his jewelry designs. Instead, he made them as expressions of art and his love for the recipient. When these pieces are auctioned today, they bring incredibly high prices.
From lecabinetdecuriosite.com All images from calder.org