The Nintendo 3DS showed this man something he’d never seen before - the third dimension
George Kokoris is stereoblind; he can't perceive the third dimension of depth using binocular vision. The slight cross of his eyes is to blame, but the angle at which those eyes cross is also a blessing in disguise for the Rare designer, because their angles intersect at the same optimal distance for viewing a Nintendo 3DS.
This piece from Kokoris is a moving, almost poetic explanation of what it's like to live with stereoblindness, as well as a tribute to the handheld device that literally showed him a new way of looking at the world. It's not that such an experience is wholly unique to him, either; pay attention to the part where he tries to compare what this realization was like for him, and see if you can think of any such feelings in your own past. Personally, I know one day that I looked up at the moon during daytime and was suddenly floored with the realization that, 'holy crap, that is a giant thing, floating thousands of miles away.'
To us, the 3D effect of the 3DS might feel like a gimmick - to Kokoris, it's a gift, and to read him express his gratitude for it is heartwarming.