User:Acrompton1/sandbox
The User:Acrompton1/sandbox theme is a theme that has captured the interest of many people over time. Since its emergence, User:Acrompton1/sandbox has been the subject of debates, discussions and numerous investigations. Its relevance extends to different fields, since it has an impact on society, the economy, technology and many other areas. User:Acrompton1/sandbox is a topic that has evolved and adapted to social and cultural changes, always remaining at the forefront of public attention. In this article, we will explore the different aspects of User:Acrompton1/sandbox and its importance in today's world.
Submission declined on 30 June 2025 by KylieTastic (talk).
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Penrose Tennis Ball
The Penrose Tennis Ball is a novel design created around 1995 by British physicist Sir Roger Penrose. It is made of two pieces of cloth that together cover a sphere shaped to that they also tile the plane as closely as possible, thus wasting the minimum amount of fabric. The problem that Penrose solved, as well as may be possible, was how to tile the plane with a piece that could also flex to tile a sphere. The pattern of lines is more dynamic than on an ordinary tennis ball. It was promoted by Pentaplex Ltd, of Brighouse, Yorkshire, who also marketed jigsaws based on Penrose tilings. Prototypes made by Slazenger were found to perform as normal balls in play, but savings on fabric were insufficient to justify retooling for manufacture. Only one Penrose tennis ball, shown here, is known to have survived.
List of things named after Roger Penrose
References
https://www.flickr.com/photos/50241745@N05/8187808503
https://find-and-update.company-information.service.gov.uk/company/02637761/officers[1]
- ^ "PENTAPLEX LIMITED people - Find and update company information - GOV.UK". find-and-update.company-information.service.gov.uk. Retrieved 2025-06-30.
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