There are some simulated-rock climbable surfaces (other than by bolting plastic holds to a wall) in New Jersey. At the new
Gravity Vault climbing gym in Chatham, including ...
Flaring chimney: Classic bent-knee chimney technique -- a bit more entertaining + strenuous with the flare. Sometimes obstructed by plastic holds from other routes - (unlike serious traditional Gunks climbers, seems like indoor NJ climbers aren't much interested in chimney technique).
Wide stemming chimney, slightly inverted: Creative move needed to get onto the first plastic hold about 15 feet up (as currently set on the red-tape route). And a frictiony step to exit. (The creative stemming move could have been set up by shaping the surface, instead of using a plastic hold, but that would have given up the flexibility of setting different creative moves later on).
Crack: It might be thought easy to simulate a crack by bolting two wood beams on the side of a house. Gravity Vault has done better in three ways:
(1) made the inside surfaces something like abrasive granite, which enables me to more easily climb it using a secret trick that is difficult to explain to Gunks climbers. I call it "jamming". (tape your hands for the abrasion, or I use those rubber-backed gloves I bought at Rock & Snow).
(2) put subtle variations in the width of the crack as you go up.
(3) the top 15 feet are overhanging. Yes, an overhanging fist crack, in New Jersey.
(I have no idea if it's intended to re-create some famous abrasive-granite crack out West somewhere)
But we're in Gunks country, so of course it had to happen: A couple of weeks ago I watched somebody
layback it (until he got to the final overhanging section).
Also you have the option of changing the difficulty by which selection of plastic holds outside the crack you use for your
feet. Or no outside holds, just pure foot-jams the whole way up.
Ken