The history of learning technology is an evolution of flat pages. The real world was flattened to book pages and blackboards, which gave way to white screens and televisions in the classroom. The 1990s internet boom ushered in the era of e-learning on the computer screen. The mobile computing boom of the past 15 years miniaturized instructional content to a phone screen. Microlearning made the lessons shorter and more video-based. But learners are still left in their own minds to reconstruct instructional content on glowing rectangular screens into lifelike scenes.