𝐄𝐦𝐩𝐢𝐫𝐞 𝐨𝐟 𝐎𝐛𝐬𝐞𝐬𝐬𝐢𝐨𝐧 𝐁𝐨𝐨𝐤 𝐈 "𝑺𝒐𝒎𝒆𝒘𝒉𝒆𝒓𝒆 𝒃𝒆𝒕𝒘𝒆𝒆𝒏 𝒅𝒆𝒔𝒕𝒓𝒖𝒄𝒕𝒊𝒐𝒏 𝒂𝒏𝒅 𝒅𝒆𝒗𝒐𝒕𝒊𝒐𝒏, 𝒉𝒆 𝒔𝒕𝒐𝒑𝒑𝒆𝒅 𝒌𝒏𝒐𝒘𝒊𝒏𝒈 𝒕𝒉𝒆 𝒅𝒊𝒇𝒇𝒆𝒓𝒆𝒏𝒄𝒆."
