Stone, as a natural material, is one of the most loved exterior materials. But it is constructed in small scales so that it can be used for an exterior material of buildings, and due to the artificial pattern generated from this process, it loses the its natural patterns. The reason why the stone work pattern of the Boulder House was important was because we wanted the building to look like one gigantic boulder. If you attach stone material with discontinuous and non-directional patterns in regular grids, you absolutely cannot make it look like one boulder. At Boulder house, we solved this problem by two methods: the first is ensuring that the patterns of the stone do not disconnect, and the second is the harmony between the patterns of the stone and the construction joints. The stone material used at Boulder house has uniform horizontal layers like sedimentary rock. Just like sedimentary strata, the façade of the building shows neatly piled-up horizontal layers. The matching direction between the patterns of the stone and the construction joints minimizes the sense of difference between these two and helps people to recognize the horizontal layer in different scales depending on the distance viewing the building from. When looked upon closer, you see the horizontal pattern of the stone and if you step back and look, the horizontal patterns of the stone disappear and the horizontal construction joints are changed into the horizontal patterns of the stone.