One of my favorite indoor activity with Libby is building forts. We have made pillow forts, blanket forts, and laundry basket forts. But I think we really outdid ourselves when we made this "fan fort":
To construct this fort we cut open 5 large trash bags and taped them into an approximate teepee shape (original plan was a large tube, but we ran out of tape so we improvised). After attaching a small fan and checking for leaks we inserted a table lamp (and loads of toys) to brighten the space up.
This fort is a perfect little hideaway. Despite being a small dark plastic cave, the fan fort is very soothing. The constant whir of the fan drowns the world outside, and it's the perfect place to read books or pretend with a friend.