How-To: “Eye of Sauron” swirly vacuum-tube pumpkin
The neatest part about this, er, “Pie of Sauron” pumpkin build by AnubisTTP is the vintage Soviet ‘dekatron’ counting tube that burns at its pupil. It’s also got LED backlighting inside. And I couldn’t resist posting this little dekatron animated .gif from the Wikipedia article: