Also mentioned here:
Machinarium - Hand Made Robots (MIGS'09)"Wanted art style to be different from Samorost.
Wanted 'hand drawn personal robots contrasting with metallic rusting robot world'.
The first hand drawn concept inspired them.
Lead artist initially produced some amazing, extremely percise pencils...
but TOO percise. They wanted him to relax his style, but he just couldn't do it.
Solution: Artist drew EVERYTHING with his left hand. 'It worked.'"