Because it's quite clearly a machine and I've known where machines come from since I was about 5.
How did you know where they came from? Did you have to see someone designing and building them to know it did not design and assemble itself?
If you saw a hammer for the first time, and were not told that someone had to fashion that hammer, would you assume it is a product of natural selection and random mutation or other "natural forces" devoid of intelligence?