Windows.

A hunter was out in the woods enjoying the wildlife and admiring the foliage.

It was soon night before he knew it. However, he was too far from the nearest town and had no tent. He noticed a small house in the distance. He walked up to it and saw that the residents were not home. He decided to just sleep in the bed and explain himself to the owners in the morning. However when he reached the bedroom he saw that there were no windows and that paintings were hanging on the walls that were extremely detailed and grotesque faces of people. He tried to ignore them and laid in the bed. He looked at the paintings which seemed to be looking down at the bed once more and went to sleep.

The next morning the hunter woke up to a surprising light. He looked around and saw that there were no paintings after all. Only windows.

-http://www.creepypastaindex.com/creepypasta/the-portraits