Le Manneken-Pis is considered by many in Belgium as the symbolic representation of the Belgian people. This has something to do with how they view themselves as people with a good sense of humor and light-hearted. Personally, I think that it is still just a statue of a little boy peeing, but what do I know, I’m not Belgian.
Jerome Duquesnoy made the statue the Elder in 1619. It is sculpted out of bronze and during its existence ahs been stolen, smashed, rebuilt, and much, much more. Therefore, the history behind the Manneken-Pis is long, if not distinguished.
Perhaps the most notable thing about the statue is that on special occasions, he is dressed up in outfits. I believe that this is every second Tuesday and special events (check on the dates--I don’t want you to go on the wrong day). He has received outfits from all around the world and everyone from state leaders to girl scouts to the Elvis fan club. I believe that there is a museum nearby that displays all of his outfits if you are interested. One of the days that I was there, he was dressed as a Swiss guard, and let me tell you, it is a very elaborate dress.
Just to let you know, there is an iron gate that surrounds the Manneken-Pis, and it can be quite high for some people. It is sometimes necessary to go back a bit in order to get a better view, but be aware of the cars that will not stop for you.
If you are interested in purchasing a souvenir of the statue, there are plenty of shops nearby. They have a wide range of Belgian trinkets in these stores, as well as the symbol of the Manneken-Pis on every possible souvenir that you could ever think of.
The Manneken-Pis is a short walk from La Grande Place; I would guess about three blocks. Therefore, it is entirely possible to do both of Brussels monuments in the same day.
While the statue may be nothing more than a little boy relieving himself, it is considered a part of Belgian/Brussels history, and I would suggest, if you are in Belgium, taking a look at the little boy.