Exacty. That's why I think it would make such a good museum piece, especially with life-sized statues of some of its former residents, it would really give you an idea of how the whole building was designed around these animals. There really isn't any hope in diguising that amount of concrete with vegetation indoors, without plenty of light any substrate kept moist will attract all sorts of fungus, or if allowed to dry out will just become very dusty. There's something slightly eerie to me in seeing half-hearted tropical theming in dry indoor spaces, when tropical forest is characterised by constant moisture on the ground and in the air. Outdoors would really benefit from huge mounds of topsoil being dumped over the entire area, and planting out with trees. I'm sure these would make superior spaces for say, tapir or bearded pig as the trees mature, and modern, low-impact sleeping quarters could be erected outside. But the interior, for me, really should not be disguised as anything but a brutalist monolith designed to dramatise the physical presence of our largest land mammals, only with statues and history replacing living specimens. While some innovation of older buildings at regents park is absolute genuis, in other parts it would be really good to see london zoo engage with its history more through some of the buildings it is forced to maintain.