And from that point on, the diagnostics went fairly smoothly. Dr. Edwards, in an icily polite fashion, explained what to expect before every test. After testing color depth, he continued on to other tests. It was actually a little bit fascinating to see Equestria's magnetic field, as well as seeing in infrared and ultraviolet. Then he switched to hearing, and Erin heard an incredible variety of sounds explode around her. Every rustling leaf, every moving animal was suddenly clear to her. Even the insects and worms burrowing under the ground could be heard. 