Technology simplifier David Macaulay (PBS's "Pyramid," "Castle" and "Building Big") surveys a mainstay of the Industrial Revolution: the textile mill. Macaulay opens the hour by demonstrating just how tedious it is to make clothes by hand. Water power changed that, and led to an economic and social revolution in the process. Macaulay charts that revolution in documentary segments, while animated scenes follow the fortunes of a mill founded by a fictitious young go-getter (voice of Derek Jacobi).