A four-year-old's people-drawing ability provides an indicator of his or her intelligence at age 14, scientists have found.
Parents might laugh at their child's quaint crayon scribbles, but the balloon heads and stick-like limbs have a serious hidden meaning, research shows.
They reveal a connection with gene-driven intelligence that has a measurable effect 10 years later.
With the help of parents, psychologists got 15,504 children aged four to take part in a "draw-a-child" test, rating each picture with a score of zero to 12.
A "moderate" association was seen between higher scores and intelligence test results both at the age of four and 14.
Lead scientist Dr Rosalind Arden, from the Institute of Psychiatry, King's College London, said: "The correlation is moderate, so our findings are interesting, but it does not mean that parents should worry if their child draws badly.
"Drawing ability does not determine intelligence, there are countless factors, both genetic and environmental, which affect intelligence in later life."