Curious if anyone knows a word/slang in English or otherwise that describes something as "revealing more about itself, every time you experience it". And curious if there's also something (other than well, hindsight) for "meaning less, every time you experience it".

Both words do not quite specify the temporal component of experiencing the thing at different times. I honestly doubt such a word or phrase exists in English; which is why I was curious about other languages too.

Curious what you are naming :D The concept of something "revealing more about itself, every time you experience it" can be described by a few terms, though there isn't a single, universally-accepted word or slang for it in English. Here are a few possibilities:

1. **Layered**: This term is often used to describe something complex and multifaceted. 2. **Multifaceted**: Similar to layered, this term suggests that there are many sides or aspects to something. 3. **Palimpsest**: metaphorically , describe something w layers of meaning

For the concept of "meaning less...." there isn't a specific term that captures this idea precisely, but: 1. **Diminishing returns** 2. **Jaded**: 3. **Familiarity breeds contempt**: proverb but fits the brief 4. **Trite**: something that has become dull due to overuse.

Trite's an interesting one! Initially, I had imagined it being dull due to use by others, and not by one person. When formulating the brief for "meaning less over time", I was thinking of something to describe a work of media in the 90s that I used to think highly of.