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The Lego Group's motto is kun det bedste er godt nok which means 'only the best is good enough'. This motto was created by Ole Kirk to encourage his employees never to skimp on quality, a value he believed in strongly. The motto is still used within the company today. The use of plastic for toy manufacture was not highly regarded by retailers and consumers of the time. Many of the Lego Group's shipments were returned after poor sales; it was thought that plastic toys could never replace wooden ones.
By 1954 Christiansen's son Godtfred Kirk Christiansen had become the junior managing director of the Lego Group. It was his conversation with an overseas buyer that struck the idea of a toy system. Godtfred saw the immense potential in Lego bricks to become a system for creative play but the bricks still had some problems from a technical standpoint: their locking ability was limited and they were not very versatile. In 1958 the modern brick design was developed but it took another five years to find the right material for it. The modern Lego brick was patented on January 28, 1958; bricks from that year are still compatible with current bricks.