Many versions of this type of convection candle are available:
From Amazon: BUY NOW Spinning Kinetic Candles
Also on eBay:
From eBay: BUY NOW Spinning Convection Candles
Spinning Snowflakes Convection Candle: a simple heat engine- rotational motion resulting from the convection of hot air due to the candle flame of a tea light. All moving parts of thin stainless steel with some assembly required. Energy transfer: chemical bonds to heat to kinetic energy of the rising air to rotational kinetic energy of the turbine and snowflakes.
Fun balance toy sculptures are available on Amazon:
From Amazon: BUY NOW Balance Sculpture Toys
Vintage Kinetic Art: Eames era kinetic sculpture seemingly defies gravity as it glides in a graceful circle. The gold plastic sphere plus wire structure is designed such that its center of mass is few centimeters below the point of contact with its base. When the sculpture is tipped or spun, the center of mass swings under the pivot point in this stable equilibrium condition- no magnets needed to create this physics magic.
Available here in many colors and sizes:
From Amazon: BUY NOW
Lava Lamp in Time-lapse: 15 minutes compressed into 15 seconds gives a different perspective on the processes involved in this classic physics toy from the 1960's. Mesmerizing physics of convective heat flow, Archimedes principle, and immiscible liquids. Manufactured by Mathmos and invented in 1963 by Edward Walker of Dorset England, the Lava Lamp is still popular today and is available in a wide range of colors.
Many animations to choose from:
From Amazon: BUY NOW Cinspinner Animation
From eBay: BUY NOW Cinespinner Animation
CineSpinner: motion animation from Moiré pattern effects of constructive and deconstructive interference. Affordable kinetic art by Scanimation creator, artist, and author Rufus Butler Seder.
Four versions to choose from!
From Amazon: BUY NOW Kaleidograph
Kaleidograph: hand held manipulable mathematical art. Stack, rotate, and flip two or more of these 12 double sided die cut cards into billions of possible arrangements! (30 shown here) A toy that integrates the math of combinatorics with the beauty of symmetry.
Available here- four versions of 360° Books to choose from:
Amazon: BUY NOW 360° Books
360° Book: Earth and Moon by Yosuke Oono- whimsical art for the science and sci-fi enthusiast. Love the UFO abducting the cow!
This vintage item is out of production. Here are some similar times based on whirlpool vorteces:
From Amazon: BUY NOW Vortex Lamps
"Pet Tornado": whirlpool powered by a magnetic stirrer (like those in a chemistry lab). The knob on the side has settings F1 through F5 ? One of my sillier toys- but vortices are just so cool.
From Art of Play: BUY NOW LessMore Bowls
Learn more about this illusion and its history on the Wikipedia page: Jastrow Illusion
LessMore Bowls: (non-physics post) these serving dishes by @artofplay are a 3D version of the famous Jastrow Illusion, where the lower curve always appears larger than the top one. Note that even after we verify the bowls are the same size, our perception still misleads- a reminder that we need science to transcend the limits of our senses.
High precision manufacturing and beautifully packaged-- Get the original here:
From the KS campaign: BUY NOW Moondrop Fidget
Moondrop: using magnets and Lenz's Law to imitate free fall times on the Moon and Mars. The key to this device is the presence of neodymium magnets in the central aluminum column. When a non-magnetic metal ring moves down, the magnetic field in the center produces an electric current in the ring. The ring then temporarily becomes an electromagnet that exerts some repulsion against the center magnets slowing the ring down. The Earthdrop (blue) has the magnets removed from the column to provide comparison. Another unique and scientific fidget toy!
The astonishing art of Raven Copeland, aka the madglasser: Buy a marble here!
From Etsy: BUY NOW Vortex Marble artwork of Raven Copeland
Magic Vortex Marble: glass art intersects with the physics of optics in another spectacular piece from lampworking master Raven Copeland aka @madglasser -The clear glass face of the marble acts as a convex lens giving the illusion that the spiral goes deeper than the diameter of the marble. A Gibson opal seems suspended in space above the unique vortex- see the @madglasserInstagram stream for more from his Magic Marble series. The vortex depth illusion in these is even stronger in person!
In 2015 these sold for $250 for the stand and hologram! Still with limited availability here and a bit cheaper in price:
From Amazon: BUY NOW Star Wars Digital Hologram
From eBay: BUY NOW Star Wars Digital Hologram
Star Wars Digital Hologram: full color digital holography brings to life “A New Hope: Death Star Battle” using the latest technology in 3D imaging. This hologram image is comprised of 734000 hogels (hologram pixels) and comes with its own display stand that illuminates from below. Unlike photographs, holograms are recordings of the interference pattern of light waves. This interference pattern can encode moving 3D images which are revealed by illumination by a point source of light and viewing from an appropriate angle. The latest hologram in my collection, and it looks even more stunning in person.
These coasters are almost sold out everywhere: only The Mona Lisa is still in stock:
From Amazon: BUY NOW CMYK Coasters
From eBay: BUY NOW CMYK coasters
The CMYK model and colorspace on Wikipedia.
CMYK Coasters: physics and psychophysics of four color printing demonstrated with acrylic slides that assemble to reveal Vermeer's "Girl with a Pearl Earring". Cyan, magenta, yellow, and black (key) comprise the elements of the subtractive color model used in most color printing. Repost of the “most liked” post of 2016!
I bought this kinetic illusion at the Exploratorium Museum back in 1995. Not sure if this model is still available anywhere. Here are some available kinetic illusions that operate on the same principle:
From Amazon: BUY NOW Spiral Spinner Illusion
From eBay: BUY NOW Spiral Spinner Illusion
Climbing Sphere Spiral Illusion: hanging by string the rotational motion of the helical spring creates translational motion downward along the vertical direction- however, the ball is often perceived to be rolling upward through the coil.
Vasa Mihich's gallery offer this piece for sale and others:
Gallery of Vasa Mihich
Also often available on eBay:
From eBay: BUY NOW Art by Vasa Mihich
Acrylic Refraction Art: “Block with Five Colors” by Vasa Mihich. Vasa’s art utilizes refraction, reflection, and color mixing to produce sculptures that dramatically change character depending on the angle from which they are viewed.
This glass device is available from this shop in Germany:
From experimentis-shop.de: BUY NOW Vanishing Glass Demonstration
Refraction Vanishing Act: the liquid (immersion oil) in this glass tube has the same index of refraction as the glass. When the oil covers the glass rod inside the tube, the rod becomes invisible! Immersion oil is used with high resolution microscopes and designed to have the same index of refraction as the glass slide and objective lens. This physics puzzle demonstration was handcrafted by a glass maker in Germany and is sold by experimentis, the online shop for physics.