I enlarge on 3. the shop next to (close to/before/opposite/in front of, etc.) where we live. Thanks to user StoneyB's answer, I did read about (See definition 2) pro-forms here.
*These are not all so absurd ..., because the spatial relationships are in most cases reciprocal: if the place where you live is ‘opposite’ the shop, the shop is also ‘opposite’ the place where you live. Still, before and in front of inverts the spatial relationship; and in all these cases, you are inverting your topic: instead of a bound relative clause describing where you live relative to the shop, you have a fused relative clause describing where the shop is, relative to where you live.
I understand the differences for prepositions that invert the spatial relationship (ie are NOT 'reflexive'), such as in front of, because X in front of WHERE we live <=> X fronts where we live, but X in front of WHICH we live <=> X lies behind where we live.
Yet what about the prepositions that are 'reflexive', such as close/opposite to? I don't understand the problems caused by 'inverting your topic'? I tried to learn about fused relative clauses.