Ravens flying to demonstrate animation of backdrops and sprites.
Backdrops based on: https://upload.wikimedia.org/wikipedia/commons/9/9e/Deutschlandfunk_und_Deutsche_Welle_K%C3%B6ln_R%C3%BCckbau_%E2%80%93_360%C2%B0_Panorama_aus_der_Luft_%E2%80%93_Oktober_2020.jpg Creative commons lincense.
