Eighty-20 is a small consulting company which does sophisticated financial modeling, as well as some solid database work. All their work is highly quantitative and relies on some serious computational power, and the logo is meant to convey it.

People first guess that 20% of the squares are darkened, but that turns out to be false after counting them. The trick is to view the dark squares as 1's and the light squares as 0's. Then the top line reads 1010000 and the bottom line reads 0010100, which represent 80 and 20 in binary.

Kinda like the surreal green screen of The Matrix, they want us to read stuff in binary

Paul Rand (who designed the iconic IBM logo in 1972) designed this 'eye bee M' logo in 1981. I like that they are quite relaxed about the logo, unlike certain other companies who do not like the logo to be tampered with in any way even for internal promotions

The above are two magazines from the Readers Digest stable. Again, the attempt to communicate what it is about quite figuratively through the logo catches my attention.