Depict the biblical scene of Revelation 4:1, where a door stands open in heaven with a trumpet-like voice speaking. Create this scene in the style of pointillism, an art form that emerged in the late 1880s characterized by distinct dots of color applied in patterns to form an image. Make sure no text or words are included in the image, and the interpretation is respectful and devotional to Christianity. Include elements like clouds, light emanating from the doorway, and the impression of sound waves for the trumpet-like voice.