require 'io/console'
console_xy = IO.console.winsize
SIZEY =  console_xy[0]
COLWIDTH = 3#self explanatory, each bar will have this width in chars
SEPARATOR = 1#number of cols separating two bars
SIZEX =console_xy[1]/(COLWIDTH+SEPARATOR)
count = []
SIZEX.times do
  o = rand(SIZEY)
  count << o
end
loop do
  a = []
  SIZEX.times do |i|
    o2 = count[i] + rand(-1..1)
    count[i] = o2 > SIZEY ? SIZEY : (o2 < 0 ? 0 : o2)
    COLWIDTH.times do
      a << ([" "]*count[i] + ["♪"]*(SIZEY-count[i]))
    end
    SEPARATOR.times{ a << [" "]*SIZEY}
  end
  sleep 0.1
  system('clear') || system('cls')
  puts a.transpose.map(&:join).join("\n")
end