If you asked Zander what the best part of having a baby sister is, he might say it is the influx of colorful toys. (Okay, so he probably wouldn't use the word "influx.")
But, I am not exaggerating when I say that he can play with baby toys for an hour or so. Be it a box of rattles, teethers, and crinkly things or a mini-gym for babies to lay under, he'll make up some story to go along with them and play by himself for a good clip.
Here he is using the gymini (a thing for babies to look up at) and the couch cushions to make a tent: