Can't save object sessions

session.rb

require 'rubygems'
require 'sinatra'

enable :sessions

before do
  if session['rand'].nil?
    session['rand'] = rand(1000)
  end

  if session['object'].nil?
    session['object'] = Object.new
  end
end


get '/' do
  #session['rand'].to_s
  session['object'].object_id.to_s
end