This "Teachers" competition reminded me of an interesting fact that my teacher taught me when I was young.
He told us that 1 + 1 = 2, but 1 + 1 = 1 too. Our first response was like, "WHAT?" Well, he said that 1 pile of sand add to another pile of sand will be a big pile of sand.
WOW! Since then, I've been looking at things around me differently and even came out with my reasoning for 1 + 1 = 3, 4, etc.
I would like to dedicate this to that teacher of mine and indeed, 1 sand castle + 1 sand castle = 1 big sand castle.
Have fun voting and enjoying all the doodles! :)