Notice how the first pic indicated that if it see obstacle, light turn from green to red, then will move away from obstacle.
It may not look it because of the art style, but the little robo is going into a dark room(what i assume to be a bedroom), finding something in its way, and turing around. While i agree its a little hard to tell, that is what the cartoonist is trying to illustrate.
While a wall there would be plausible given the shadow, given that the artist clearly trying to convey fear, it would be counterproductive for there to be one. That being said, I see it to be a long dark hallway next to a lit room
Yupper that works! Now just imagine your roomba going down the middle of the hallway past your room only to stop and turn around when it should be able to keep going xD. Not immediately creepy, but does leave you wondering whats repeatedly stopping it from going to the end of the hall.
I'm finally back. Spoiler: Source : The Whimsical Cursed Sword, NSFW because of one character and his shenanigans, but doesn't appear for a few chapters.