Students made this! <3

draw.rb

# if this fails, you can get it with `gem install chunky_png`
require 'chunky_png'

bg_color   = ChunkyPNG::Color.rgb 100, 50, 0
line_color = ChunkyPNG::Color.rgb 150, 150, 200
canvas     = ChunkyPNG::Canvas.new 1200, 900, bg_color

i = 0

while i < 100
  canvas.circle  600 , 450, 100 , line_color
  canvas.line    500+i, 350+i, 500, 350, line_color
  canvas.line    400+i, 450+i, 400, 450, line_color
  i += 1
end

canvas.save("pic.png")