National Cubicle Day is observed on April 28 each year in the United States to appreciate the cubicle, a workplace innovation designed by Robert Propst. This holiday honors the cubicle's role in creating individual and private workspaces that enhance productivity by minimizing physical distractions. Employees celebrate by beautifying their cubicles, often competing to create the best Feng Shui layouts. The day has gained popularity over the years, with more individuals participating and engaging in various activities to commemorate the design of the cubicle. The cubicle was first introduced by Herman Miller under the name "Action Office II," which evolved to meet the changing demands of office environments.