The article describes the bouba-kiki effect, where people associate the pseudo-word "bouba" with round shapes and "kiki" with sharp shapes.[2] This effect manifests itself in early human development and is durable across different cultures and languages.[2] On page 836 of the issue, a study by Loconsole et al. states that they also observed this effect in newly hatched chicks.[2][5] Chicks at the age of 1 day and 3 days spontaneously chose the sharp shape for the sound "kiki" and the round shape for the sound "bouba".[5] The authors suggest that these are innate cross-modal associations of sound and shape, shared across species, rather than a phenomenon specific to human speech.[2][5] The results suggest a predisposed shape-sound matching mechanism that may be widespread across species.[5]