"How to Enter a Temple"
When you go to a traditional temple there are often three doors. It’s important to note which door you are supposed to enter through and which door you are supposed to exit out of.
There is a saying that states: “Left is the green dragon, right the white tiger”. Because we are viewing the temple from the god’s point of view, situated inside, it is the opposite when we are viewing from the outside. That is why you have the other saying: “Enter through the dragon door, leave through the tiger’s door.”
Many of the temples have carvings of dragons or tigers beside the door that you should enter/exit through.
So why are you not able to enter through the middle door? This door is reserved for the god or for VIPs (the “officials”, basically anyone who is from the government). Everyone else should not go in the middle door.