LOL...I have 3 boys ages 3, 4 and 8. Trust me when I say there is nothing to worry about and I doubt it has anything to do w/ curiosity but it is FUN! We have playgroups and when we go to a girls house the only things my boys are interested in mainly is dress up (Princess dress, heels, tiaras, the works), the kitchen, the babies etc...why...b/c we don't have any! The first things the girls do here at our house it put on a tool belt and a hard hat and grab the trucks w/ the biggest tires and go to town. It is simply fun! If I were 3 again and had to chose between my plain sneakers and my moms pretty, high heels in different colors (not to mention to awesome and loud clipity clop sound on the tile they make)I would defiantly go for the "fun" ones. My suggestion is pay no attention, he is a baby, he is playing, to him it is fun and different. A suggestion if he likes to dress up or wear fun shoes is after Halloween when all the costumes go on sale, go buy a few extra for him so when he is looking at your shoes you can say hey, go put on your dinosaur costume. Another quick suggestion is if all your shoes are in your closet then childproof the doorknob so he cannot open it. Good Luck!