Strange Behavior?

One particular trait that Rory has displayed during her toddler years has been the propensity to line-up her toys in straight lines (with no prompting or modeling from either of her parents). Sometimes, she'll take puzzle pieces and place one in each of the tiles that lines our bath tub. As you can see in this picture, Rory was moved to take each of her toys from her "toy shelf" and line them up in a quite inconvenient place.

A little odd if you ask me.