above abstract aeroplane airplane appearance below between blue cloud cloud-formations clouds colored colors coloured colours conditions dark flight formations gray grey high in-between layers levels light multi-level patterns plane shadows shapes skies sky sunlight textures travel up-above variations variety various various-cloud-formations weather weather-indicators white 3-D advertising bright center centre color coloration colour communicating communication demtal-care dental design distinctive expressing expression eye-catching golden identification indentifying indication information informative informing lettering letters medical notification notifying raised rounded semi-transparent shiny sign style surface surfaced surfaces surfacing surgery tactile texture textured words