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    "# Blockly deconstructed\n",
    "\n",
    "Consider this [blockly program](https://blockly.games/bird?lang=en&level=2#562ubo).\n",
    "\n",
    "![blockly-bird](blockly-bird.png)\n",
    "\n",
    "This is actually a full computer program! When you succesfully complete it, you can see the automatic translation to Javascript. (Javascript is obviously a different programming language than Python, but the important points we can discuss anyway.)\n",
    "\n",
    "```\n",
    "if (noWorm()) {\n",
    "  heading(0);\n",
    "} else {\n",
    "  heading(90);\n",
    "}\n",
    "```\n",
    "\n",
    "if we would re-write this in Python, it would be:\n",
    "\n",
    "```\n",
    "if noWorm():\n",
    "    heading(0)\n",
    "else:\n",
    "    heading(90)\n",
    "```"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Let's discuss what is going on here.\n",
    "\n",
    "(Discussion of computer program, computer, operating system, external world.)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Consider this [blockly program](https://blockly.games/music?lang=en&level=3#juok8w).\n",
    "\n",
    "![blockly](blockly.png)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "The main conceptual new thing is the use of **functions**."
   ]
  }
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