The film is based on the thought of KE Tsiolkovsky about "radiant mind" - a possible way of spreading human consciousness in the Universe. Dramatization: a table for tea is laid in the garden, women in white dresses, a boy swinging on a swing, walking across the field. House-Museum of Tsiolkovsky in Kaluga. Premises, interiors and expositions of the museum. River embankment in the early morning, lanterns are on. Sunny landscape with a river. Starry sky. Gramophone. Clockwork.