This thread contains a very simple question that can be answered by doing a quick experiment.
I want you to close your eyes and to imagine just one apple in your mind.
After that, I want you to add one apple. If you still have a clear image of two apples in your mind, then add another apple, etc.
As soon as you cannot add another apple before one of the previous apples disappears in your mind, you stop.
When I did this experiment myself, I had no trouble imagining seven apples. But as soon as I tried to add an eighth apple, another apple would disappear.
I found this quite odd, as mental arithmetic is not a problem for me. In other words, I know that, but clearly I cannot imagine 8 objects.
I wonder if there is an explanation for this.
So, my question is: How many apples can you imagine in your head?