What you experienced might also be more similar to https://en.wikipedia.org/wiki/Synesthesia https://en.wikipedia.org/wiki/Synesthesia, since the bouba/kiki exp

What you experienced might also be more similar to https://en.wikipedia.org/wiki/Synesthesia https://en.wikipedia.org/wiki/Synesthesia, since the bouba/kiki experiments are mostly about people judging the quality of a match between sounds and pre-prepared images, rather than having them spontaneously visualize images based on the sounds. Many synesthetes experience a consistent match between words or sounds and visualizations, but not necessarily the same pairing that other people do.