I remember reading about similar phenomenon concerning colours - people who have one word for red and purple in their language treat them as same colour; I can'

I remember reading about similar phenomenon concerning colours - people who have one word for red and purple in their language treat them as same colour; I can't find a link to those information provided in concise manner on this topic. However, I think both of these facts are smaller than the title could suggest - though it seems that usually we put 'things' we think about into buckets (so if you put both 4 stones and 5 stones into bucket 'many' you can't distinguish between them) labelled by words from language we use, it gives us little insight on how language shapes our cognitive algorithms, which is much more interesting question to me.