Meaning of the word "(if you've) seen one, you've seen them all" in English

What does "(if you've) seen one, you've seen them all" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

(if you've) seen one, you've seen them all

US /ɪf juːv siːn wʌn, juːv siːn ðəm ɔːl/
UK /ɪf juːv siːn wʌn, juːv siːn ðəm ɔːl/
"(if you've) seen one, you've seen them all" picture

Idiom

used to express the opinion that all things or people of a particular type are very similar and that there is no need to see or experience more than one

Example:
I don't need to visit another art gallery; if you've seen one, you've seen them all.
All these new cafes are the same; if you've seen one, you've seen them all.