general | April 28, 2026

How do you fidget with a coin?

Flip the coin from your pointer finger to your middle finger.

  1. When you push up with your pointer finger, you push the coin up and away so it can flip onto your middle finger.
  2. When the coin is resting on your middle finger phalanx, slightly raise your ring finger to get ready for the next flip.

What is a haptic coin?

A whole new twist (quite literally) on the everyday fidget tool, the Umburry Haptic Coin provides both tactile and audible feedback in a slim and compact stowaway coin. It’s made up of 2 opposing coin shells with 5 neodymium magnets attached to each side along with a thrust bearing system.

Why does a coin seem to disappear underneath a glass?

When 100% of the light reflects in this way it’s called total internal reflection. With the glass filled all the way to the top, none of the light from the coin at the bottom can escape through the sides. It’s trapped. It can never reach your eyes and so the coin seems to vanish.

Why can’t you see a penny under a glass of water?

When the cup is filled with water, the penny disappears. This happens because of refraction. As light travels through the sides of the glass and the water, it’s refracted and never reaches our eyes, which makes the penny seems to disappear.

What are the odds of flipping heads 9 times in a row?

There is a 38.7% chance of getting a heads 9 times in a row.

What is a contact coin?

More than Meets the Eye Designed specifically for finger manipulation, the Deadeye Coin is a ‘contact coin’ as Aroundsquare calls it. With practice, you’d be able to roll it fluidly between your fingers, back and forth over the thumbs, or ‘isolations’ where the coin appears to be floating around the fingertips.

Can you really levitate?

Normal things, even humans, can levitate if they are placed in a strong magnetic field. Although the majority of ordinary materials, such as wood or plastic, seem to be non-magnetic, they all exhibit very weak diamagnetism. Such materials can be levitated using magnetic fields of about 10 Tesla.

Why can’t you separate your ring fingers?

Unfortunately for the ring and middle fingers, they have no independent flexors or extensors. Instead, they move only with the muscles common to all fingers. Because the nerves for the ring and pinky finger are intertwined, it becomes harder to move each of these fingers separately.