He likes to holler

Lately, Nikolai has discovered echoes. Namely, that he can shout into almost any cylindrical object and his voice will come back at him distorted.  He shouts into cups, water bottles, even his baby bathtub.  Then the other day, he crawled over to the sliding door and grabbed the PVC pipe that keeps it shut and started shouting into it too! 

Cutest baby ever!