A roof structure is designed to create multiple opportunities for visitor and mountain lion to meet underneath. The structure has been placed on the border of the enclosure, the place where mountian lion and visitor bump into each other. Reflecting to the situation in Phoenix a structure is designed in such way that the visitor has the feeling he or she is in control, as well as the zookeeper is in control. This is accomplished in different ways. A readable grid structure has been designed so the human will have overview. The roof structure has the form of a modern steel barn, ‘the ones you see everywhere in Arizona’, it also looks like a roof on top of a viewing dek. The whole structure will be made from ‘off the shelve products’ like, iron beams, corrugated steel sheets, concrete floors and metal rods. All products will be recognizable for human as man made materials. The whole structure is detailed in such a way that it could be a toolkit. The utilitarian look comes forward from the human need of control. It makes clear that the enclosure is designed by - and for human.