very close field speakers

I saw what is called an egg shell chair, a chair that is made of fiberglass and shaped like an egg with a small opening in the front. When you sit inside of it you are in a partial sound proof anechoic chamber. The chair I saw had speakers in it and it would make listening to music would be a most intimate experience with the music. What sort of speakers would produce a sound comparable to good floor standing speakers but in flat enough profile to fasten to the interior of the egg shell? Or, would headphones be the only choice?