The Penrose Stairs is an optical illusion and an example of an impossible object. It depicts a staircase that appears to ascend or descend endlessly, creating a paradox where one can continuously climb or descend without ever gaining height or depth. This design challenges our perception of three-dimensional space. Created by mathematicians Roger Penrose and his father, Lionel Penrose, the stairs are often illustrated in art and architecture. They are a part of a broader category of impossible objects, which also includes figures like the Penrose Triangle. These concepts highlight the intriguing relationship between perception and reality in visual representation.