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Don't worry we've already pivoted. We're no longer using concrete blocks, now it's giant LEDs.

Unfortunately we lost the entire first floor when we dropped a block and filled it in.

And efficiency's down to 12% because of all the backlights for the ads and all the graphics chips got hacked and are mining bitcoin.

> I don’t think that works if the blocks are reflecting light

From a long distance the colors would merge in the eye. And this would be visible from a long distance. Imagine it on a high spot next to a city.

Use 4 colours then: cyan, magenta, yellow and black (CMYK, as used in print).

Well they could be transparent (Red/Green/Blue filter) glass blocks stacked in front of a reflective screen...

One question is... visible from the sides, from above, or both?

Or just CMYK like printers...

Why wouldn't it? Your eye does not know the provenance of the light that hits it. Red light is red light.