Fully assembeld high quality clocks available here:
From Etsy: BUY NOW: VFD Tube Clock
Vintage VFD Tube Clock: before seven segment LEDs there were Vacuum Fluorescent Display tubes in which zinc oxide coatings emit green light when bombarded by electrons under high vacuum. A phosphor coated anode segment only illuminates if it and the grid (seen in close up) are both energized at positive potential. This clock features an eight digit IV-18 display tube manufactured in the 1990s and cofigured to power up via a USB cable - old tech meets modern electronics in an elegant acrylic case.
Get this set here:
From Etsy: BUY NOW Hardwood Pentominoes
Many versions available here:
From Amazon: BUY NOW Pentominoes
The book by mathematician Solomon Golomb that started the polyonomo recreational math craze:
From Amazon: BUY NOW: Polyominoes
Pentominoes: The 12 possible arrangements of five identical squares joined edge to edge. Since 5x12=60, the pentominoes can tile a 6 x 10 rectangle with no gaps (2339 ways to do this- yet even finding one solution is a challenge). I love this beautiful set from artist/woodworker Ron Moore where each pentomino is made from a different kind of hard wood.
Some nice versions of this impossible object available here:
From Etsy: BUY NOW: Golf Ball in Wood Cage
See more of these thought puzzles in my collection here: Impossible Objects
Impossible Caged Golf Ball: Here a regular off-the-shelf golf ball somehow trapped within a cage made from a solid piece of hardwood walnut. Neither the ball nor the wood were cut or glued in the fabrication process. The puzzle aspect is to consider how this object was produced (I have some theories- but I do not know the secrets of this artist).
Versions of the Gee Haw Whimmy Diddle available from these sources:
From Etsy: BUY NOW: Hooey Stick Folk Toy
From Amazon: BUY NOW Hooey Stick Folk Toy
From eBay: BUY NOW Hooey Stick Folk Toy
Phase Locking Folk Toy: rubbing the stick over the notches creates both vertical and horizontal vibrations- and leads to an elliptical motion of the nail in the center of a propeller, which begins to rotate due to friction with the nail. This toy is called a Gee-Haw Wimmy Diddle (see the Wikipedia page- I kid you not) or a Hooey Stick. Note that depending on how the stick is held, the propeller will spin clockwise or counterclockwise.