Joshua Vides sees things in black and white. And with the skill of an illusionist and an eye for twisted art, the Left Coaster’s handiwork is drawing the attention of funky car fanatics ...

return [nums[i:i+3] for i in xrange(0, len(nums), 3)] if all(nums[i+2]-nums[i] <= k for i in xrange(0, len(nums), 3)) else [] ...