But when the surviving kitten saw my drawing, he began crying so piteously, reaching out and clawing towards the drawing -- and this went on for most of an hour -- that there was absolutely no mistaking the emotion behind it, and soon everybody else in the room was bawling as well. (Also, I was impressed that he responded to a drawing; it was a decent drawing, but quite abstract relative to (say) a photographic representation. Cats usually seem oblivious to photos in any case, and this is one of the things which confounds animal consciousness research: it's very hard to tell the difference between something that an animal can't do, and something an animal doesn't want to do. I suspect that most of the time, cats simply can't be arsed to process static 2d imagery, because what's really the point of doing so -- but in this case, an overwhelming emotional imperative overrode that natural disinclination, proving that both the cognitive and the emotional capacity is there.)
Anyhow, ever since witnessing that display of emotion, anybody who tells me that animals aren't conscious or don't have real feelings immediately gets ranked -- per my personal hierarchy of the spectrum of consciousness -- as being far below the level of that kitten.
Recognizing the chalk drawing isn't as surprising as you might think. Cat vision emphasizes movement, edges, and contrast. Photos are very flat, but sharp lines catch the eye. An image doesn't have to be perfect to summon a strong memory.
One time when my friend went on a trip and left his roommate in charge of catsitting, the male cat was tragically killed by a car. The roommate found the body and, not wanting to leave it on the street, put it in a duffel bag and brought it home.
Of course the sister cat smelled the bag and knew exactly what was in there. She came to her own conclusions and carried a grudge against the roommate for years (hissing, glaring, etc) until they finally moved out. It was especially peculiar because she is one of the most friendly, cuddly cats with everyone else.
I've always known our cats have emotions and understand a lot about the world they're in, but after that experience, I have no doubt that they are conscious.