This work develops a phenomenological account of mindfulness, and related phenomena. It is divided into two main parts. The aim of part one is to articulate a pre-phenomenological sketch of mindfulness by drawing on passages from some of the classic works of Western literature and everyday life, through an interpretation of the Satipaṭṭhāna Sutta and by the means of a critical analysis of the contemporary attempts to account for these phenomena. Part two adds further detail to the sketch by entering (...) a dialogue with the phenomenology of Edmund Husserl. A key distinctions made here is between the transcendental horizon and the open horizon. This difference allows cultivating mindfulness to be defined as the practice of tuning-out of the transcendental horizon and tuning-in to the open horizon. Mindfulness—the potential fruit of tuning-in-tuning-out—is defined as the feeling of being tuned-in to the open horizon.A key findings of this research is that tuning-in-tuning-out is a difference practice than the phenomenological epoché; whereas the latter discloses the transcendental horizon, the former discloses the open horizon—on which the transcendental horizon is dependent. These findings open up the possibility of a phenomenological description of certain phenomena that are closely related to mindfulness. Some of these phenomena are: Mindful attention, which is defined as the function of foregrounding a sub-horizon within the open horizon and the pushing of the other sub-horizons into the background. Concentration : the narrowing down of the open horizon to one of its sub-horizons. Insight : the activity of isolating a sub-horizon, discerning its thingly possibilities, zooming out, isolating a second sub-horizon and discerning its thingly possibilities, and then contrasting the two in such a way that their difference becomes vividly present. (shrink)