Well, if you want to meditate on multi-layered themes, there's always the wild fox koan [1]. As others have noted, concentration in and of itself is not all of

Well, if you want to meditate on multi-layered themes, there's always the wild fox koan [1]. As others have noted, concentration in and of itself is not all of what meditation is. There are so many different sorts of practice traditions. In some practices there isn't an object of concentration at all, for instance in Mahamudra's teaching of samatha [2]. And you're certainly right that meditation can lead to unhealthy mental states, which is why it's important to work with a teacher or a practice tradition. [1] https://en.wikipedia.org/wiki/Wild_fox_koan https://en.wikipedia.org/wiki/Wild_fox_koan [2] https://en.wikipedia.org/wiki/Mahamudra#%C5%9Aamatha https://en.wikipedia.org/wiki/Mahamudra#%C5%9Aamatha