More than anything else, Disney Imagineers are amazing at hiding necessary functionality in plain sight. What I mean is, if you go to a local amusement park, you will see lighting cables, speakers, support beams and all the other "things" that are necessary to make the park work all around you. At Walt Disney World, those same things are all hidden from sight to complete the feeling of immersion in the story being told.
A great example of this can be found in this year's Osborne Family Spectacle of Dancing Lights display. If you walk by the Plaza Hotel facade, you will see a light display of Christmas carolers. They are standing in front of a Bellhop Station, which you'd expect to find at any ritzy hotel.
Looks fine, right? Well if you pay careful attention you will notice the Bellhop Station is actually a speaker. To make the Osborne Lights, there needs to be some speakers on the ground (most are above you in windows and rooftops) and rather than just have a speaker out in the open, Disney covered them up to look like a Bellhop Station.
Just around the corner is another covered up speaker, this one made to look like a marble slab that is part of the hotel's exterior.
All of this is a great example of the subtle nature of theme that Disney prides itself on. Frankly, details like this are meant to be overlooked because Disney does not want you to see a speaker. Rather, they want you to feel like you're in a city enjoying the Osborne Lights.