blue cloud clouds colored colors coloured colours conditions fine formations light shapes skies sky southern sun textures thin vaporish vapourish variations various cloud formations weather white wispy air atmosphere cloud formation clouded cumulus dark formation gray grey heavy huge massive meteorology nature rain stratus structures water above abstract aeroplane airplane appearance below between cloud-formations flight high in-between layers levels multi-level patterns plane shadows sunlight travel up-above variety various various-cloud-formations weather-indicators