An orangery is a greenhouse-like structure attached to a house used to protect citrus trees and other exotic plants. It has highly glazed walls and ceilings to maintain a greenhouse effect. When designing an orangery, the materials should be glass, the walls should be tall to allow air circulation, the ceiling should be adjustable to regulate sunlight, and temperature regulation is needed to prevent overheating. Orangeries originated in past centuries but remain a popular way to enjoy plants and relax.