How does Nicholas spend his time while he is in the lumber room in Saki's story "The Lumber Room"?

In “The Lumber Room” by Saki, Nicholas implements his plan to enter the forbidden room while his aunt searches for him in the gooseberry garden. Being just a little boy, Nicholas practiced using a key for days before he had the opportunity to use the real one to enter the lumber room.
While he was in the room, Nicholas was treated to a variety of items that brought him great delight and intrigue. One of the first things he did was to examine the scene depicted on a piece of tapestry. To the little boy, the scene of a hunt came to life as he imagined the sights and sounds associated with the hunter aiming the bow and arrow at a stag as dogs joined in the hunt. But, the boy could see what the hunter could not. There were wolves descending on the man and dogs, which left Nicholas wondering how the story would unfold.

First and foremost there was a piece of framed tapestry that was evidently meant to be a fire-screen. To Nicholas it was a living, breathing story; he sat down on a roll of Indian hangings, glowing in wonderful colours beneath a layer of dust, and took in all the details of the tapestry picture. 

The tapestry was not the only object of delight in the room. There were dust covered rugs, lamps, paintings, pieces of china, candlesticks, and a variety of books. In addition, there was a plain bound book, which Nicholas thought would not hold any interest for him. But when he opened it, it was filled with pictures of exotic birds, the likes of which he had never seen.

Less promising in appearance was a large square book with plain black covers; Nicholas peeped into it, and, behold, it was full of coloured pictures of birds.

Nicholas spent his time in the lumber room enraptured by its contents of curiosities.