Yes, it is fun to watch this in the level 2 quotes (although the true high frequency stuff is surely in and out before it has time to show up, I assume). Put an

Yes, it is fun to watch this in the level 2 quotes (although the true high frequency stuff is surely in and out before it has time to show up, I assume). Put an order at the bid or the ask (depending on direction) and move it up or down a penny and watch all the other nearby open orders instantly reshuffle.