With proportion its everywhere like you could have a tall person and a short person a fat person and a skinny winny person... Sad, happy... get the point!!! so yeah its like so easy to find... With similarity i think of it as twins twins are similar.. Also like some animals look the same an elephant is going to be pretty similar to another elephant.. dogs not so much because there are so many different breeds and stuff.. With zebras as many have said.. most zebras look the same.. so yea there is a lot of proportion and similarity i the world and u can find it if you look for it... It wont take that long... :)