I mean that putting a large sell order at 224 would make the buys (at the moment, at 220) move lower as the orders are filled by other people selling to them. You could then move the wall downwards, say to 221, when the sells in the orderbook had also moved downwards from 222. At this point the market's state would be something like buys at 218, sells at 220, and your wall at 221, effectively having pushed the market downwards from where you started.

I hope this made what I meant a bit clearer.