The realistic foundation
Slipstream's strangeness depends entirely on the solidity of the realistic world it disturbs. Without a convincingly real world — with specific textures, specific social dynamics, specific economic and geographical details that make the reader feel grounded — the strange elements have no ground to violate. Slipstream authors must be committed realists in the construction of their worlds before they can introduce the elements that make those worlds slip. The strangeness is most effective when it arrives in a world the reader has fully inhabited: not the abstract realistic setting but the specific place with specific smells, specific light, specific social friction.