Psychiatrist Dr Karen Norberg, of National Bureau of Economic Research in Cambridge, Massachusetts, spent a year knitting an anatomically correct replica of the human brain.
Dr Norberg used different colours to represent parts of the notoriously complex organ.
The frontal cortex is cream and pale green, the visual cortex a mix of blue, purple and turquoise while the hippocampus is made up of baby pink wool.
The two sides of the nine inch brain - one and a half times life size - are joined together by a zip with the cerebellum knitted in blue and spinal cord trailing off in white strands of wool.
Dr Norberg, from the National Bureau of Economic Research in Cambridge, Massachusetts, said she was determined to finish her challenge once she had started: "It was a labour of love. ...