playing possum

I read in a book recently about the whole "no girls allowed" phase and I thought naively to myself, 'boy, Ivar is so good at playing with his sisters. I wonder if he missed that phase.' I think it was the very next day I found this sign outside of his little fort. He told me it was a picture of Elsie and Harriet and that they were not allowed in his Possum House. And I couldn't decide if I was more amused by his awesome drawing or the fact that he was playing possum.

Then Elsie assured me, "it's okay because I am playing blossom over here!"