Hey—really blown away by the level of artistry going into these. It's going to be heartbreaking to choose just one!
I thought for the final day I should give a heads up about our favorite things so far.
The design that accurately shows how text will be appearing is #3, by galland21. (Simple text directly over the two halves of the brain.) This submission is also amazing and has an especially brilliant right side, as well as a great minimalist brain.
The most creatively brilliant left side we think is design #9 by StudioNLK—a background of light binary digits with some geometrical designs over it!
Our two favorite designs overall so far are #48 by BINATANG and #45 by Piantoperdente (though #45 we'd love the formulae to be removed from the left). (They're extremely different, but both stunning in the kind of elegant/geometrical ways we're looking for.)
I share all this in the interests of transparency, not to encourage mimicking. So grateful to see everyone's art the last couple of days!!