The article "An instructive experiment" was published in the journal Science, Volume 391, Issue 6787, Page 842 in February 2026. It is an instructive experiment that explores the connection between sounds and shapes, known as the bouba-kiki effect. People in several cultures associate the word "kiki" with sharp shapes and "bouba" with round shapes[3]. The study tested this effect on newborn chickens (Gallus gallus), which are a precocial species allowing testing soon after hatching[3]. Both three-day-old and one-day-old chickens spontaneously chose the sharp shape for the "kiki" sound and the round shape for the "bouba" sound, similar to humans[3]. The results suggest an innate mechanism for linking shape and sound dimensions that may be widespread across species[3].