Some things that appear not to work
This is in some sense "less than a partial answer". But since this simple-looking puzzle has been here unsolved for so long, even with a bunch of hints, it seems worth doing anything that might help. So, here are some things I've considered that don't appear to lead anywhere useful. (Obviously I'd prefer to post a list of ...
No. The rectangle has an area of $75$ square units. The only other rectangle with integer sides that would have the same area would be $3*25$ (or $1*75$ technically, I guess).
The rectangles you have are $3*6, 2*3, 3*2, 2*4, 4*2, 10*2$ and $9*1$. The $9*1$ needs a $9*2$ paired with it to fill those rows and prevent leaving a $1*x$ space that cannot be ...
I think this is about
because when you look at the Annoying Books,
Then this becomes essentially a word-property question:
Bearing in mind that one odd-one-out among the Annoying Books, it might be some property of:
For the books in the picture, those are:
The answer is
thanks to @Deusovi himself in the comments. It did cross my mind, but I didn't find a convincing explanation, especially one that would fit the hints:
I think the answer is
Previous partial answer:
Ideas that don't work:
If you're looking for a simple and pure visual puzzle, you can use:
"Spot The Twin" a.k.a "Find Two Identical Image" Puzzle
It ranges from an easy one like this...
... to an intermediate one...
... or even to a hard one...
... or if you want to make it in a single style, you can use something evil like this ;)
How about pre-constructed Minesweeper positions?
As for the desired features:
1) + Pure logic
2) + Purely visual
3) + Arbitrarily scalable (consistency checking proven to be NP-complete)
As for the disliked features:
1) + No words required
2) - Almost, but not quite, everyone already knows minesweeper
Here are three puzzles with $3$ visual images, each being $2\times 2$ Raven matrices:
This last one is a little more unique, but quite easy like the previous ones:
I cannot find such a puzzle with just $2$ visual designs. I guess it is unlikely because the more objects there are in the puzzle, the more specific the pattern. Like, I might have the sequence $...