I THINK a wall is when the lanes are like, just no pattern, just, full oil. BUT I AM REALLY JUST TAKING A WILD GUESS HERE! haha I am also curious, I will keep checking on this post.
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15 years and still going strong! 15 years old that is! DA DA DAAAAAA!! UP UP AND AWAY! TO THE BAT CAVE ROBIN!

The way Bob7 states his conception of a wall is the way I look at it also.  10 to 10.  Very lil lane conditioner outside of ten "walled" up at 10 board or thereabouts with over 50 units.  

This started in lacquer days with blocking lanes.  Continued in 70's and 80's when short oil was used before the three unit rule.  <Short oil was limited to length 24 or 26 ft. can't remember.  Proprietors did not strip everyday most once a week.  Players used pearlised under reactive balls.>  "Walls" made the swing player popular.... miss outside ball comes roaring back to pocket miss inside ball slides into pocket <carry might not be as good missing inside.  Over/under reaction on "walls" can befuddle many bowlers.  Fluffers use the dry outside to advantage and boomers can play deeper inside miss outside and still get to pocket.  Boomers can leave some weird split combos on "walls".

IMO...basically every proprietor uses some type of "wall" in a THS.  Why averages are so inflated and everybody thinks "boy am I good".  Bowl on a flat conditon where the lane man doesn't give you help and you'll find out how good you really are.  You'll see this at ABC Natl's.

Scott

I had never had experience bowling on a wall shot until my freshman year of college when my bowling coach drilled hours of practice learning to play the twig. My normal conventional line was around the 7-8 board, so it became a challenge to trust the ball up 1,2 or 3 board.

When I bowled in many New York houses that year, I saw what a wall meant. As long as I hit through the ball up the first 5 boards, I would hit the pocket. It was only a matter of carry.

I don't see very many walls in Mass., but last year I experienced one subbing in a league with my friend. For 3 weeks of subbing, my low game was a 205 and I had a high of 278, without much effort. The league had 7 300 games, 5 800 series, and at least 10 people averaging 220 or better...

Matt