I don’t put much stock in these, and I imagine I saw the cat first because I like cats and the cat image is big and black. But the analysis of the cat is also more accurate for me than the mouse.
For this one I did not even register that there were clouds until I read the description. I would imagine that is true for most people though.
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I didn’t notice the clouds until reading your prose, also the first picture I noticed the cat first and it was only when looking harder I saw that the smaller picture was indeed a mouse and not a rabbit as I thought when I first noticed it.