My mind is bound by my reality thus is part of my reality - An Anti Solipsist Argument

Example of the "Bondage" argument:
Premise 1: If something is bound by the laws of its reality then it is part of that reality.
Premise 2: My body is bound by the law of gravity.
Premise 3: Gravity is a law of my reality.
Conclusion: My body is part of my reality.
Now can this "Bondage" argument be applied to my mind. Is my mind bound by my reality in some way?
Well, if reality comes from my imagination then I should be able to visualise, in my mind, a colour that I cannot percieve with my senses, a new colour (ie: not blue, green, red, orange, yellow, pink, purple, white, black, brown, grey or any shade of those colours).
I cannot visually imagine a new colour.
Why not?  If the world I percieve comes from my mind then why can I not visualize, in my mind, a new colour?
There is one possible explanation. My reality does not come from my imagination. Just the opposite, my imagination comes from my reality, is part of my reality and so my ability to imagine is bound by my reality.
I believe that all we do when we imagine is combine and arrange different elements of our percieved reality the way that musicians combine and arrange notes on a stave to make a song; thus we put horn and horse (2 things that exist in reality) together and get unicorn  but, just as a musician cannot hear in their head a note that does not exist in reality, so we cannot imagine a thing that is not merely an assemblage of things from our percieved reality.
And why is my ability to imagine limited (bound) by my reality? Following my bondage argument, it is because my imagination is part of my reality.

Addition to my argument -

Our minds think in 4 dimensions. Why? Because our reality, the reality we percieve, is 4 dimensional and our minds are part of our reality. If our minds weren't part of our reality they would think in more than 4 dimensions.