On: Stacking concrete blocks is a surprisingly efficie...

[Lxr]

> Think of it as a VERY slow, VERY large TV screen. With red, green, and blue blocks, they could advertise almost anything!

I don’t think that works if the blocks are reflecting light rather than emitting it.

[csours → Lxr]

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

[LanceH → csours]

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

[TallGuyShort → LanceH]

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.

[mchahn → Lxr]

> 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.

[martalist → Lxr]

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

[kurthr → Lxr]

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?

[kurthr → kurthr]

Or just CMYK like printers...

[dTal → Lxr]

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