The first thing to notice is that the layout of the blocks is vertically reflected, but most corresponding blocks across the two halves do not have the same appearance. Some blocks appear smoothly shaded, while others are divided into monotone segments - one block (the bottom block in the centre column) has both.
The title provides a clue about what these blocks could represent: they're capital block letters (the building blocks of English) viewed from above in the top half and from below in the bottom half, and are shaded as though they were being lit from the viewing direction in each case. This means that white parts of each block letter are oriented towards the viewer, black parts are oriented perpendicular to the viewer, and shades of grey represent all the surface orientations in between.
Only a few pairs of blocks are ambiguous. The blocks that are solid white from both top and bottom could be either E or I, and the blocks with white-to-black gradients on both top and bottom could be either D or B. Depending on the exact shape of the letters used, O and C could also be ambiguous, but since the pairs with black-to-white gradients on both top and bottom must be C, this is evidently not the case. (G is also unique here, as it's curved like O on the top and like C on the bottom.) Solving the entire array gives us the following rows of letters (ordered according to the top view):
S E/I B/D E/I (The only possible word here is SIDE.)
We have the words SIDE, FRONT, ANGLE, INSPECT, AMALGAM, and OGLE. We also haven't yet used the peculiar spacing of the letters in each row, or the fact that the entire array has been reflected rather than each individual letter. Together, these clues suggest we might want to inspect (or ogle) the complete amalgam of letters from a front or side angle. The fifteen letters visible from the front of the array are ORIGINALGTANAME. A quick search reveals that the original development name of the first game in the Grand Theft Auto series (a game that gives you an abundance of top-down views of actual building blocks) was Race'n'Chase.
|The answer is: racenchase|