Acharya Prashant explains that attachment is fundamentally an action of time and space. The human brain, being a material entity existing in time and space, naturally gets attached to whatever it remains close to for a long period. He illustrates this with the example of iron and cobalt fusing over time, suggesting that the brain similarly identifies with its surroundings. Since birth, the most immediate and constant presence is one's own body, leading to the deepest attachment and the belief that one is the physical form contained within the skin.