Comparing a Ship on Horizon to a Man's Dream

There is an effect of comparing a ship on a horizon to a Man's dream. A ship on a horizon is just a metaphor because a ship can never touch a horizon no matter how far it sail out. A horizon is like a line where the earth and sky look like it is meeting, but that is just because of the distance you are standing at. The horizon is compared to a man dream because it is saying he may see his dream ahead of him but he will never reach it no matter how hard he try to attain it. It is stating that neither are possible to do.