Thunder is limited to a single space (what seems to be a university building), and a single gesture (the ghostly image of a woman veering and uncovering her face), and through a mathematical and arbitrary series of possibilities the film builds up expectations, disappointing them, bringing them to paroxysm and surprise each time the viewer believes the film has exhausted its systemic possibilities. A gesture of shame, of timidity thus inhabits a building like an monomaniacal ghost projected upon its walls, captured in a photograph, re-animated through stop motion, granted a half-life between the perceptible world and the imagined one.
Source: Mubi, June 04, 2015