Nicky has discovered two things he loves: oranges and his belly button.
With oranges he goes back and forth all day long, alternating between eating them, rolling them, sitting on them, and eating some more.
His belly button is just like Calvin's belly button phase (minus the belly bumping). He rubs it, shows everyone, pulls up everyone's shirt to look at theirs, and sticks his finger in it while sleeping.
I'm not sure whether perpetually squashed oranges or fingertips of belly button lint disturb me more.