In this task, we ask you to write an answer to a question that involves event "frequency", which refers to how often an event is likely to be repeated. For example, "taking showers" typically occurs ~5 times a week, "going to Saturday market" usually happens every few weeks/months, etc. Note that a lot of the questions could have more than one correct answer. We only need a single most-likely answer. Please try to keep your "answer" as simple as possible. Concise and simple "answer" is preferred over those complex and verbose ones.

Sentence: Durer rejected Alberti's concept of an objective beauty, proposing a relativist notion of beauty based on variety. 
Question: How often are philosophical concepts rejected?
sometimes
The sentence is discussing how Durer rejected a philosophical concept from Alberti. Thus, we can use "sometimes" to describe that some philosophical concepts are rejected..