Inception has an ambiguous ending that leaves the audience wondering if Cobb (Leonardo DiCaprio) is still dreaming or is awake and finally reunites with his family, and one subtle detail puts an end to this debate. Christopher Nolan’s movies are known for dealing with themes like time and identity, and in Inception, he mixed these with the complexity of dreams. Inception was a critical and commercial success, and its regarded as one of his best works, despite leaving viewers with a huge question at the end.
https://screenrant.com/inception-cobb-detail-wedding-ring-ending-reality/