Homework: Write a julia script that produces a 2x2 matrix containing
   pixels for a raytraced sphere.

   Or any other script that requires the use of these operators or
   functions. Information on arrays can be found
   at [1]https://docs.julialang.org/en/v1/manual/arrays/

References

   1. https://docs.julialang.org/en/v1/manual/arrays/