Explore collective intelligence as collective computation in this 30-minute conference talk by Jessica Flack from the Santa Fe Institute. Delve into the mathematics of collective intelligence, covering topics such as John Wheeler's contributions, physics at macroscopic scales, and the role of information in shaping systems. Examine how components act as imperfect information processors, investigate microscale phenomena in biology, and learn about overcoming subjectivity through uncertainty reduction. Discover the elements and examples of collective computation, including circuits and Babbage's work. Analyze biological principled dimension reduction, the information bottleneck concept, and hourglass emergence. Conclude by addressing future directions and key issues in collective intelligence research.