Blow-Up ending explained

What happens

Thomas returns to the park and finds the body gone, his photographs stolen. Mimes play a tennis match without a ball. He throws back their imaginary ball, hears the game, and vanishes from the frame.

The last image

Thomas disappears from the grass, leaving an empty green park as the sound of a tennis ball plays on.

Two readings

1 · Reality needs beliefThomas joins the game and hears the ball, so what feels real may rest on shared agreement.

2 · He gives upWith no proof left, he accepts uncertainty and slips out of the picture.

What it says

Thomas looked harder than anyone, yet ends up with no proof and no connection to what he saw. By closing on the sound of a ball that isn't there, the film suggests that seeing is never the same as knowing.