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The flywheel spins so smoothly once the candle warms the cylinder, it's hypnotic. My son loves hands-on science, and this solid little engine made him actually ask how a heat difference creates motion.

Watching the little engine piston pump away with just a candle underneath is mesmerizing—the solid metal base stays perfectly stable even after an hour of running. I set it up on my desk during a work break and couldn't stop staring at the smooth, continuous motion.

The polished brass finish looks far more expensive than what I paid, and the flywheel spins with a satisfying smoothness once the tealight warms it up. My kids argued over who got to light the candle first, which says everything about how engaging this little machine is.