@ThylacineAlive Not sure if I entirely agree with this sentiment, while functionality is certainly important, a big part of a zoos job is to introduce and educate the public about the ecosystems they are a part of. The visual component is an important part of that.
@DelacoursLangur I do agree with you, though I don't think this particular enclosure does a horrible job of that. While obviously real rocks do not look like this, the visitor will understand that these primates live in rocky areas. I guess I should specify that looks don't matter from a husbandry standpoint. It doesn't matter if a capuchin has an acre of natural field to wander, it's the big cage with ropes hanging from it that'll meet its needs.
@ThylacineAlive I guess its all in the eye of the beholder, but to me these are some of the least convincing fake rocks I have seen. Mostly because they clash horribly with the green lawn surrounding it.