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From Amazon: BUY NOW Rainbow Diffraction Candle
Diffraction Spectrum Candle: a thin plastic diffraction grating surrounds the flame in this rainbow producing design. The rainbow spectrum is produced not by refraction like that of a prism, but instead by diffraction, where light waves deconstructively and constuctively interfere.
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From Amazon: BUY NOW Infinity Tea-Light
Infinity Mirror Tea-light Candle: parallel partially mirrored panes of glass create the illusion of multiple candle flames through the physics of reflection and refraction. Featuring candles from my collection this month as the winter solstice approaches.
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From Amazon: BUY NOW Candle See-Saw
Bimetal Seesaw Engine: candle powered heat engine- with bears! A coiled bimetal strip, like that found in a thermostat, uncoils when heated by the flame while moving a counterweight that shifts the center of mass to the left and takes the coil out of the flame. The coil then cools returning the counterweight to the right which places the coil back over the flame- and the process repeats until the candle burns out. Any device that converts heat energy into mechanical motion is called a heat engine- like the very simple one here.
Many types and themes available:
From Amazon: BUY NOW Christmas Pyramids
Holiday Pyramid: a simple heat engine- rotational motion resulting from the convection of hot air due to the candle flames of two tea lights. These holiday decorations come from a German Christmas tradition, Weihnachtspyramide, that dates back more than 200 years! Energy transfer: chemical bonds to heat to kinetic energy of the rising air to rotational kinetic energy of the turbine and reindeer.