This question is a soft one. Well, So far I have noticed stuff that is nice in math, particularly in algebra, topology and analysis. For instance, in algebra, there is theorem that says that we can think of groups just as some set of permutations. So, in other words, can we say all groups are just permutations? Also in topology we classify surfaces. In fact, we have that every compact connected surface is either a sphere, an n-torus of $n-$ projective planes. Is there any similarity in measure theory? It seems like math is just like comparing things. Is this true? Also, one last question, What is the big picture that everyone talks about?