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Santiago Robinson
Santiago Robinson

Crazy Roll 3D: How to Unlock All the Rare and Colorful Balls


While these results illustrate play behavior in the bees, Galpayage says, the research does not show any motivations for it. Determining whether the insects are playing for pleasure, for instance, would require analyzing which neurotransmitters activate during ball rolling.




rolling balls



Angular kinematics of the hip, knee, and ankle joints, as well as ball velocity and accuracy for stationary and rolling balls were compared in a futsal (Five-a-Side Indoor soccer) context. Ten futsal athletes performed five kicks each on stationary and rolling futsal balls. Six digital cameras (120 Hz) recorded the kicks. For both kick types, angles for hip, knee, and ankle joints were calculated using Euler angle conventions. Angular velocity, ball velocity, foot linear velocity, relative velocity, and accuracy also were analyzed. The kicking of both stationary and rolling balls showed similarities for ball velocity (24.2 +/- 2.2 m/s and 23.8 +/- 2.7 m/s, respectively), foot velocity (17.6 +/- 1.8 m/s and 17.2 +/- 2.2 m/s, respectively), and accuracy (26% and 24% target hits, respectively). We observed few differences in angular kinematics and angular joint velocities between kick types. Elite players can make online adjustments in the preparatory phase so that kicking a rolling ball is almost exactly like kicking a stationary ball.


Bumblebees play, possibly just for the fun of it. The insects repeatedly chose to roll wooden balls in an experiment despite having no clear reward for doing so. The discovery may be the first documented evidence of insects playing.


Samadi Galpayage at Queen Mary University of London and her team were inspired to investigate if bees play after finding that the insects could be trained to balls into tiny soccer goals for a food reward in 2017.


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In a new study, the team placed 45 buff-tailed bumblebees (Bombus terrestris audax) of different sexes and ages in an arena with a single entrance. There was a clear aisle from the entrance to pollen and sugar water in the back of the chamber, but the insects had to pass between two adjacent rooms with 18 colourful wooden balls to get there. One room had free-moving balls, while the other had balls that were glued down.


Over 18 3-hour sessions, the bees opted to enter the zone with free-moving balls 50 per cent more often than the zone with stationary balls. Each bee rolled balls between one and 117 times throughout the study despite having no obvious incentive to do so.


In their earlier experiments where the bees were taught to score goals with wooden balls for treats, the scientists from Queen Mary University of London noticed something unexpected. Some of the bees were voluntarily rolling the balls around outside the experiments without any incentive. That they were doing so of their own volition suggested to the researchers that perhaps they were enjoying themselves, in the same way a dog might play with a fluffy toy or a kitten might tear apart a ball of yarn.


Another round of experiments saw the bees given access to a pair of colored chambers, with one containing balls and another one completely empty. The balls were then removed, but the bees gravitated toward the previous play arena, showing a preference for the chamber where they had spent time with the wooden balls. Younger bees were found to roll the balls more than older bees, and males bees were found to roll them for longer periods than the female ones.


As for why the bees might be engaging in play-like behavior is another question. Play behavior is believed to contribute to the development of cognition and motor abilities, such as foraging skills, for example. While the evidence suggests the bees found the ball-rolling rewarding, the scientists say further work is needed to understand the evolutionary advantages of it, and the role it might play in brain development.


This new tip design incorporates our nylon plastic on the top half of the tip and our Ultra High Molecular Weight (UHMW) material on the bottom half of the tip. This new material allows for the tip to last 3 to 4 times longer than the regular nylon rolling ball.


Silver Sphere is a Creature in Elden Ring. Silver Spheres are giant sentient balls of dark silver that can chase and run the Tarnished, as well as other enemies, including their fellow Silver Tears. They can be found hanging suspended from ceilings around Nokstella, Eternal City.


  • Price: $11.95 Shipping: FREE From our Distribution Center Quantity: Continue Shopping Product Features Product DescriptionAsk a Question?Product FeaturesWell-designed next generation cane tip.

  • For use in all places, especially outdoors.

  • Rolls easily along the ground; much easier on the arm.

  • Ideal for constant contact technique; audible tap is eliminated.

  • Features a large hollow sphere (2" in diameter) with encased stainless-steel roller bearing.

  • Hook-on style makes for easy attachment to our compact, folding, or kiddie canes.

  • Lightweight and easy to maneuver; handles road obstacles and cracks in the pavement.

  • Package Weight: about 2.5 ounces.

Product DescriptionThis is a fantastic, next-generation cane tip! It's well-suited for use anywhere, but simply shines outdoors. The tip hooks onto the bottom of the cane (just like all the others), but instead of staying in one place like the stationary models, this one rolls whenever you're walking and the cane is touching the ground. This offers you greater sensitivity and visibility while traveling. The audible tap is also eliminated, as this tip is ideal for the Constant Contact Technique. So how does it work, anyway? Basically, this quality tip consists of a large hollow sphere (two inches in diameter) with an encased stainless-steel roller bearing. Its hook-on style provides for easy attachment to any of our folding white or kiddie canes. The rolling tip is lightweight and simple to maneuver, and easily handles road obstacles and cracks in the pavement. This roller tip truly makes cane travel a lot easier - and much less tiring, too (as you don't have to keep lifting and tapping the cane). Most users agree it's well worth the price!Ask a Question About this Product(From the White Canes shelf.)Related Products: Rolling Marshmallow Tip (AmbuTech) Upgraded Marshmallow Cane Tip - Moves When You Do Item Number: 1121 $12.95 Tell Me More Stationary Marshmallow Tip (AmbuTech) Spare/Replacement Cane Tip - Hooks On in Seconds Item Number: 1117 $3.49 Tell Me More Stationary Pencil Tip (AmbuTech) Alternate Hook-On Cane Tip - The Traditional Model Item Number: 1118 $3.49 Tell Me More Metal Glide Tip (AmbuTech) Long-Lasting Cane Tip - Well-Suited to Indoor Use Item Number: 1119 $4.95 Tell Me More Rolling Disk Tip (AmbuTech) Durable Nylon Wheel that Doesn't get Stuck Item Number: 1122 $14.95 Tell Me More


Intuitively, our rolling ball sifting algorithm works by rolling two balls (one above and one below) of a chosen radius simultaneously along the oscillating data curve as demonstrated in Fig. 1 (also see Supplementary Information for the software implementation). The data points touched by the ball above and the ball below the curve form the upper and lower envelopes, respectively according to the chosen radii. The raw rolling ball envelopes (red and green lines in Fig. 1b) of a bruit are well-defined in the field of computational geometry as alpha shapes19,20. It has been proved that the alpha shape of a set of data points is a subgraph of the Delaunay triangulation (DT) of the set of data points19. Therefore, the raw rolling ball envelopes in Fig. 1b can be found very efficiently by DT18 (a partial DT is given in Fig. 1c). For constructing smoother rolling ball envelopes, we need to sift out the local maxima only touched by the upper ball and the local minima only touched by the lower ball respectively. Last, taking a monotone piecewise cubic spline interpolation of the sifted maxima and minima to form the smooth upper and lower envelopes (Fig. 1d), we are able to define a local zero for the extraction of high-frequency signals such as bruits very effectively as shown in Fig. 1e.


Row 1: A 5-second-long carotid sound signal (same as Fig. 2). Row 2: IMF1 of the carotid sound in black with the upper rolling ball envelopes of the intermittent bruits with a cutoff frequency of 200 Hz in red. Row 3: Extracted bruits magnified 100 times in blue. Row 4: The convolution results of the extracted bruits in Row 3 by a Hanning window of 0.05 seconds. Row 5: Autocorrelation of the blue bruit signals (Row 4) for deriving their periodicity information.


(a) True bruits have both rolling ball and high pass results agree with the heart sound pattern. (b) Only the rolling ball sifted bruits agree with the heart sound pattern. (c) Bruits are only detected by the high pass filter. (d) A complete occluded carotid artery has visible bruits.


I just returned from a month at Hong Kong University, visiting James Fullwood, an algebraic geometer who likes to think about the mathematics of string theory. There, I gave a colloquium on G2 and the rolling ball, a paper John Baez and I wrote that is due to appear in Transactions of the AMS. This project began over a decade ago in conversations between John and Jim Dolan, later continued between Jim and me. Though Jim opted not to be a coauthor, his insights were crucial.


When Jim Dolan and I started talking about this problem, we set out specifically to explain that funny ratio. We took our cue from Bor and Montgomery, who in their excellent paper G2 and the rolling distribution, write:


When R=3R = 3, G 2\mathrmG_2 acts on S 2SU(2)S^2 \times SU(2) as symmetries preserving lines. To understand this action, it helps to introduce yet another variant of the rolling ball system: the rolling spinor on a projective plane.


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