Fisheyed Glass Globe Doorknobs - the globe on your end of the door provides a wide-angle view of what's on the other side, which is achieved by collecting and reflecting light soaked up by another globe on the other end. I'd consider using this at my front and back door.
Ecosphere The amazing EcoSphere is the original self contained aquatic ecosystem. Enclosed in glass, this miniature ecosystem is self sustaining with the perfect balance of animal and plant life. Not only are they pieces of art and a novelty, they're a tool used for learning and education.
Doors galore - 8 places to find midcentury modern entry doors + DIY tips