Flow is a psychological state defined by an intense presence in the moment and a merging of action and awareness. A gymnast performing a well-practiced routine, or a musician reciting a piece may experience a sense of flow.
Reading about these states, I was struck by how little was written about it why this is desireable. Why do people pursue flow? Some do it for some purpose, such as performance or artistic creation, but I think most who do would agree that there is something intrinsically pleasurable about the experience regardless of its function.
So, emotions right? What a heckin' experience! Certainly one of the more attention-grabbing features of the human condition. But what even are they?
Something that I think is dangerous when building a philosophical system is a fetishization of a lack of emotion. Emotionless detachment certainly has its uses, but there are rich and deep colours of the tapestry of human experience that one deprives oneself of. Does the unwise stoic cut a piece from themselves in order to pursue their system? Is it worth it? Not to me.
Mary and the Black and White Memory Implant
In 1982, Frank Jackson published an article entitled "Epiphenomenal Qualia" in Philosophical Quarterly 32:127. Within it, he outlined a thought experiment known as "Mary's Room", or "Mary and the Black-and-White Room". 
Imagine a scientist called Mary. She is born and raised within a black-and-white room, where she experiences no colours. Mary is a talented scientist, and learns an enormous amount about the physics of colour, the mechanism by which the human eye detects colour, and the pathways through which colour is interpreted within the brain.