"""Because horror on earth is real and it is every day. It is like a flower or like a sun; it cannot be contained"(186). Is this a metaphor or a simile?""

It is actually
two similes because it first compares horror on earth to a flower and then it compares it to a
sun.  They are both similes because each use the word like.  Sebold is
purposely using two positive and common images to compare to horror.