Copying this post from a previous one I did a few months back:
It started with my vision of making a globe shelf that met the following criteria (usually mutually exclusive):
1. Globes as close to ceiling as possible
2. Bulbs centered vertically inside globes
This design fit both of these criteria together. Plus, you can change the bulbs without touching the globes, and change the bulb height for different globes with little effort.
The shelf is supported by brackets on top, so there are no visible supports under it.
The globes are on a central dimmer, located in the back corner on the bottom side of the shelf.