Films resembling Synecdoche, New York?

So, I recently began watching a lot of the films made by Charlie Kaufman. One in particular, Synecdoche, New York, I find extremely interesting.

I was wondering, if anyone could recommend films that are kinda the similar? And by that, I mean where there is a bit more going on that just drama/romance/comedy/etc. Where you’re actually forced to think (and learn(!)).

Thanks! :)