you do see it... the 4th dimension is spin, which we can see, even with the naked eye. The 5th dimension are vibrations within the molecules. I'm rusty with this..i did this shi* at university but I can't remember the details of this. Not sure if there are more dimensions after this.
Time has been considered the 4th dimension since Einstein's theory of special relativity.
There are four observed dimensions! You forgot time! :)
I struggle seeing things in 3D nowadays. Please don't add more.
one of them is time. You understand that.
by what we see,taste,touch and feel? this seems like a loaded question