Some prepositions like "auf" or "in" can use either accusative or dative case depending on usage.
What I'm wondering is: Are there minimal pairs of sentences, that differ only in the case after the preposition, such that the case alone changes the meaning of the sentence? Or is the selection of case always tied to the verb.
I'm thinking along the lines of "Ich fahre in die/der Stadt" but I'm not sure if that works as such an example.