image = [
  [0,0,0,0],
  [0,1,0,0],
  [1,0,0,0],
  [0,0,0,1]
  ]

image.each do |row|
  puts row
  puts "next"
end

# outputs:
[0,0,0,0]
next
[0,1,0,0]
next
[1,0,0,0]
next
[0,0,0,1]
next