Kawasaki's 'Square Four' engine layout wasn't revolutionary (Ariel’s 4-stroke Square Four was launched in 1931 and continued in production until 1959), and was intended to offer a balance of compact size and smooth power delivery, combining the benefits of multi-cylinder performance with reduced vibration compared to an inline-four design.
Judging by these pictures it seems to have been a viable running machine, though as with the Yamaha GL750 it sadly never made it into production, coming as it did at same time as Kawasaki's more conventional (and commercially successful) machines such as the Z1.
Apparently Yamaha also made a 4 cylinder 2T,but both bikes were killed off before production.
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But I see what you mean. 