From Mary Oliver's Long Life:
And here I build a platform, and live upon it, and think my thoughts, and aim high. To rise, I must have a field to rise from. To deepen, I must have a bedrock from which to descend.
For Oliver, the platform is the physical world, nature, but I'm thinking that such a platform for thought could be any number of venues, different for each person really. A place--real or metaphorical--chosen because it is rich and evocative or perhaps even just because it is where one has been set.