This picture is actually a reference to a painting I came across a few years ago called "Jesus on the Tube" by Antonia Rolls In the original, Jesus is riding a London Underground train and being ignored by everyone else. Being ignored is expected on Underground trains, but the fact that they are ignoring something so iconic and special makes it a very surreal scene. The painting has since been used a lot in Christian teaching to talk about people's habits of missing good things even when they're right in front of you, amongst other messages.I remembered the painting recently, and had the idea of recreating the scene with pony characters, simply because I liked the concept. Celestia is used in Jesus' place because she is possibly the most noticeable and revered pony in Equestria, so creates a similar sense of implausibility by being featured in the scene.