The summit of Tryfan is famous for the twin monoliths of "Siôn a Siân" ("Adam and Eve" in English), a pair of rocks some three metres high and separated by 1.2 metres. The rocks are visible from the Ogwen valley. Those who tackle the "step" between the two rocks are said to gain the "Freedom of Tryfan". However, the exposure on one side is quite great, and mountain writer Frank Showell Styles said: "In calm dry weather it is not too hard a step but the penalties of failure are unpleasant in the extreme."