TiensTiens café is built on a narrow sitealong the street in Sanlitun. The site, of only 60 sq. m., is just a gap between two buildings but with two big trees in it. The architecture is conceived as a series of planes at different height floating around two trees, where customers can experience the trees from various positions and have visual contact between planes. These planes are organized with a spiral circulation, bringing the guest from counter area on street level to the rooftop terrace seating right underneath the tree crown. The both visual and movement continuity between inside and outside blurred the boundary and make the building dissolved into a green world.