By Teresa Wright THE CANADIAN PRESS OTTAWA _ When you walk through the doors of the National Gallery of Canada and spy children playing on a massive new art installation now gracing the main entrance, it’s clear the gallery’s new Indigenous art exhibition is re-writing the rules. The installation, created by internationally renowned Sami artist and architect Joar Nango from Norway, is a two-storey structure that invites visitors not just to observe its mixed-medium elements of wood and tanned animal skins, but includes a collection of books visitors can pick up and leaf through _ books on activism, colonialism and Indigenous architecture, all from the artist’s personal collection. The piece is one of several in the public spaces of the gallery that were created “in-situ,” shaped…