Stem cells are a special type of cell because they can develop into many different cells, and in times being able to multiply to create something new. So with this visual, we used prisms' way to manipulate light to reflect this 'magical' type of cell. As the visuals continue through the story, we start with one cell, then showing multiple (referencing the ability to develop into more cells), and the the last visual representing the cells coming together to form something new.