Now I've encountered plenty of ambivalence over this in my readings.

The two sides:

1.) Authors encourage walking in, taking a very defined look at the surroundings (proudly) and making your way towards wherever you'll be to play the eye game (if she looks at you twice, smiles back at you, etc. -- you're there)

2.) Walk in completely clueless to everything (Style mentions that he sort of knows everything that's happening around him without taking a second look, which is a great skill) and just go up to whatever you like.

I personally play the eye game a lot, but I don't take a few seconds to scope everything out when I walk in. If you're social enough you'll either have women close up to your vicinity or eventually bump up with one in between groups of people.

Do discuss though.