class Array

# File lib/shoes/manual.rb, line 4
def /(len)
  a = []
  each_with_index do |x, i|
    a << [] if i % len == 0
    a.last << x
  end
  a
end

# File lib/shoes/manual/app.rb, line 8
def dark?
  r, g, b = self
  r + g + b < 0x55 * 3
end

# File lib/shoes/manual/app.rb, line 13
def light?
  r, g, b = self
  r + g + b > 0xAA * 3
end