This is "A Vision of the Trinity" painted by Giovanni Battista Tiepolo. It was created around 1735 for a chapel at Nymphenburg palace outside Munich, and it's considered one of his most striking works.
Here, Saint Clement kneels in the foreground, gazing up towards a vision of the Trinity above him. God the Father and Christ are seated on a cloud, with the dove of the Holy Ghost hovering below. You can see the beautiful use of colour and light that Tiepolo was celebrated for - bold primary colours mark the different parts of the painting, from the red carpet to Saint Clement's yellow vestment.
Note how the classical arch in the background pours in pale light, drawing our eye towards the action in the foreground. The kneeling saint appears to be moving upwards, towards his vision, creating a sense of movement and energy in the painting. It's not just a static image - it's almost as if we're seeing a moment of spiritual awakening unfold before us.
The composition is highly dramatic and elegantly refined at the same time. This small oil on canvas painting may be considered a sketch for the larger altarpiece, but it's already a complete work of art in its own right.
A Vision of the Trinity hangs in The National Gallery on Trafalgar Square, London — free to enter. Point your phone at any artwork there and audioguide.london plays a free audio guide in six languages — no app download needed.