I've heard it said that Teichmüller space gives a metric to the space of all metric spaces.
If this is so, where do the Lp spaces sit in the space of all metric spaces?
I've heard it said that Teichmüller space gives a metric to the space of all metric spaces.
If this is so, where do the Lp spaces sit in the space of all metric spaces?
What you heard said is wrong. Instead, the Teichmüller space of an oriented surface $S$ of finite type gives a metric to the space of (isotopy classes of) complete, finite area hyperbolic metrics on $S$, meaning Riemannian metrics of constant curvature $-1$.