Casa dei Ceii is a small upper class house, with a tremendously interesting history, in Pompeii. Here we see the wall placed behind the small garden. The scene (and I tell you, it is huge, probably 5x5 m) was probably meant to make the room look bigger than it really is. Notice how close it is in style to some of the paintings at the Villi Oplontis (compare the small yellow area to the right with this painting from Oplontis).
It is also interesting to notice the small square holes in the wall - these are marks of shelfs being put up on the wall during antiquity. Now, this is one of the largest and most beautiful paintings in Pompeii. Why would anyone ruin it in this manner? We find similar refitting in other houses in Pompeii and there's also other evidence telling us that something wasn't quite right in the city at the time of the eruption. Something was going on during that last years of the city.