This chapter aims to understand tech culture, its values, and its biases. The chapter revolves around a mapping of the magic metaphor in tech, how it is used, and what its function is. It concludes that the magic metaphor signals the possibility of the impossible, of solving all kinds of problems: the physical so-called “real” world has shortcomings that can be addressed through programming languages on big sets of data, which can make our world a better place in the future. Manipulation, control, and progress are themes that resonate in modernity. Therefore, I argue that tech culture could be understood as modern mathemagics. I depart from the current disenchantment with tech, most passionately addressed in the field of critical data studies. I will connect this to 16th-century theologian and philosopher Bruno’s teachings on magic, in which he argued that mathematical magic risks becoming evil.