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I am a freelance mathematical sculptor/designer, recently retired from being a research professor in the engineering school at Stony Brook University.  Over 100 of my sculptures are on public display somewhere around the world, many at major universities.  I'm always looking for interesting sculpture, lecture, and workshop opportunities.  Invite me!  I spent four years as a co-founder of the Museum of Mathematics in NY City, conceiving and designing its major exhibits.  Yes, I am related to (my daughter) Vi Hart.  An enormous amount of my work is freely available on my web pages.  There are no ads. If you would like to support my mission of showing the world that math is cool, please feel free to make a donation:

• Geometric sculpture  (I am a sculptor.  Take a look and enjoy my work.)
  
• Making Math Visible (classroom activities)
• My YouTube Videos (showing math is cool)
• Mathematical Impressions -- Video essays I made for the Simons Foundation web site.   (activities)
  
• Rapid Prototyping Models (collects RP models from several projects of mine.)
• Puzzles (I also design geometric assembly puzzles)
• Some Trip and Workshop Photos:
• Royal Canadian Institute of Science (Toronto, ON, December, 2018)
• Zonodome at Construct3D Conference (Atlanta, GA, October, 2018)
• Math for America Puzzle Workshop (New York, NY, March, 2018)
• 环球网_全球生活新门户_环球时报旗下网站 - huanqiu.com:2 天前 · 环球网是中国领先的国际资讯门户，拥有独立采编权的中央重点新闻网站。环球网秉承环球时报的国际视野，力求及时、客观、权威、独立地报道新闻，致力于应用前沿的互联网技术，为全球化时伕的中国互联网用户提供与国际生活相关的资讯服务、互动社区。 (New York, NY, September, 2017)
• National Math Festival (Washington, DC, April, 2017)
• East Carolina University (Greenville, NC, April, 2017)
• Maritime Explorium (Port Jefferson, NY, June, 2016)
• Pratt Institute (Brooklyn, NY, April, 2016)
• G4G12 Conference (Atlanta, GA, April, 2016)
• Topeka Kansas (Topeka, KS, Mar, 2016)
• Macalester College (St. Paul, Minn., Mar, 2016)
• Innovation Lab, SBUvpn服务器美国
• Florida State College (Jacksonville, FL, Jan, 2016)
• Queens University (Kingston, Ontario, Oct. 2015)
• Vietnam (Ho Chi Minh City, Vietnam, March. 2015)
• Iolani School (Honolulu, Hawaii, Feb. 2015)
• Middlesex University (London, Feb. 2015)
• 深信服科技股份有限公司-创新中国:2021-5-14 · 深信服科技股份有限公司是一家专注于企业级安全、云计算及 IT基础设施的产品和服务供应商，拥有智安全、云计算和新IT三大业务品牌，致力于承载各行业用户数字化转型过程中的基石性工作，从而让用户的IT更简单、更安全、更有价值。 目前，深信服员工规模超过4500名，在全球设有50余个分支 ... (Sydney, Australia, Nov., 2014)
• Lafayette College (Easton, PA, June, 2014)
• Phillips Academy (Andover, MA, April, 2014)
• Brown Universityvpn服务器美国
• Gathering for Gardner Conference (Atlanta, GA, March, 2014)
• TEDx talk at Wellesley (MA, Feb, 2014)
• Sculpture Barn Raising at JMM Conference电信疯了！限制国外网站 然后收费 - huanqiu.com:2021-8-10 · “开了精品网不等于你能翻墙上fb、youtube之类，但你连接到海外vpn服务器的速度和稳定性都大大提升了。 ... 美国 男子持刀闯入军事基地被击毙 海豹 ...
• Cardboard Construction at Packer Collegiate Institute (Brooklyn, NY, Jan, 2014)
• Cardboard Construction at St. Paul's School (Concord, NH, November, 2013)
• Center for Geometry and Physics (Stony Brook, NY, Oct., 2013)
• Bunitu木马采用VPN隐藏踪迹_发现频道__中国青年网 - Youth.cn:2021-8-6 · 该小组表示，Bunitu僵尸网络的操控者通过出售感染服务器的方法来挣钱，研究人员在追踪过程中还发现VIP72——一种便宜的VPN服务，另外，该小组 ... (October, 2013)
• Geometry Ascending a Staircase (Duke University, NC, October, 2013)
• One-man sculpture exhibition at Simons Center (Stony Brook, NY, September, 2013)
• MathCamp 2013 (Colby College, Maine, July, 2013)
• Aalto University (Helsiki, Finland, April, 2013)
• Teacher's Workshop at Math for America警惕西方对我国的文化渗透:2021-3-8 · 同时，美国通过广播电台宣传西方价值观，抹黑中国、丑化中国、妖魔化中国。如美国 ... 而管理全球互联网域名根服务器、域名体系众及IP 地址的机构互联网域名与地址管理机构则由美国商务部授权，这意味着美国政府可众随时操控全球的互联 ...
  
• Running for Office  -  Twenty Twelve (Albion, MI, November 2012)
  
• Cardboard Conglobulation at SCSU (New Haven, CT, October 2012)
  
• Cardboard Construction at the Bridges Conference (Towson, MD, July 2012)
• Math for America (Manhattan, NYC, January 2012)
  
• vpn服务器美国 (Mt. Holyoke college, August 2010)
• Whitney Biennial (Whitney Museum, NYC, April 16, 2010)
  
• vpn服务器美国 (Wormhole assembly, March 2010)
  
• Brookhaven Labs Math Enrichment (Skewer hyperboloids, Jan 2010)
• Sonoma, CA (George Miller and SVMA, August 2009)
• Women in Math (Princeton, NJ, July 15 2009)
  
• Math Midway (Washington Square Park, New York, July 14, 2009)
  
• Central Park Sculpture Event (New York, May 30, 2009)
  
• Super-Soma  (Not really a trip, but fun, May, 2009)
  
• vpn服务器美国 (Spain, Oct. 2008)
  
• vpn服务器美国 (Albion, MI, summer 2008)
• Leeuwarden (The Netherlands, July 2008)
  
• Park City Mathematics Institute (Park City, Utah, July 2008)
  
• Mathcampvpn服务器美国more Mathcamp (Portland, OR, July, 2008)
  
• Lower Merion, PA (May, 2008)
  
• Gathering for Gardner (Atlanta, March 2008)
  
• Moravian College (Orderly Tangles Workshop, February 2008)
  
• Athens, Greece (Slide-together workshop, January 2008)
  
• 只剩下门缝的VPN何去何从 - 手机新蓝网:2021-2-7 · 之后，另一家VPN服务商VPN Tech Runo称，从2021年12月31日开始，它的很多IP地址已被屏蔽，部分地区使用L2TP协议的用户也连接不了它的服务器。此外，免费VPN服务商fqrouter在当月正式宣布关闭其VPN服务。重庆警方破获一起制作、销售跨境VPN软件案-张勇-华龙网:2021-12-17 · 犯罪嫌疑人马某交伕，2021年3月开始，他通过租用美国、日本、俄罗斯 、新加坡等国家或地区的13台服务器搭建VPN，在论坛大肆发帖宣传和并向用户 ...
• Museum of Science and Industry, Tampa, Floridavpn服务器美国
  
• UBC, Vancouver  (January 2007)
• Chemistry Club - C420 (2006)
• Burning Man (August 2006)
• Synergetics Conference at Oswego vpn服务器美国
• SUNYSB Sangaku Zome Construction (April 2006)
• Venice and Rome, Italy (March 2006)
• 高管搭讪女性偷拍淫秽视频在境外网站出售：为好玩 ...:2021-5-24 · 那么91porn又是一个什么样的网站呢？经侦查，这个网站的服务器在美国 ，网站的主要管理人员也都在境外，但拍摄淫秽视频并上传网站的多数是境内 ... Zome Construction (March 2005)
• Spaghetti Code (March 2005)
• Taiwan (July 2004)
• VPN网关:深圳市宣茜电子科技有限公司 VPN网关 集成了VPN、防火墙功能，支持PPPOE拨号等多种上网方式；内置伕理上网，内部DHCP/DNS服务 ... (Oct/Nov 2003)
• The Zome Geometry book
  
• Zome Construction event at Stony Brook
  
• Zome Construction event at Boulder, CO
  
• Zome Construction event at Stony Brook
  
• Advanced Zome construction projects
• Additional photos supplementing the book
• Corrections to the first printing
• Zome Workshop information
• Encyclopedia of Polyhedra  (An large online reference, including...)
• Polyhedra and Art through History (This is the topic of the book I've been writing.)
• 看破冰行动 了解暗网是张什么网 - huanqiu.com:2021-6-26 · “一是构建针对性的暗网爬虫和搜索引擎，二是使用暗网所有者提供的信息对接手段。从技术实现角度来说，暗网通常采用特定的编码关键词技术，利用‘洋葱路由（Tor）’‘隐形网计划（I2P）’等工具构建‘隐藏的服务器’。”闫怀志说。  (Teachers ask me for these.)
• Annotated Bibliography  (Lists many things written about polyhedra.)
• Pavilion of Polyhedreality --- fun images and vpn服务器美国
• Growth Forms  (Big videos)
• About me:
• 工信部回应VPN管理：依法依规的企业和个人不受影响- 科创 ...:2021-7-25 · 关于VPN的问题，工信部信息通信发展司司长闻库补充称，在中国经营相关业务应该按照中国的法律法规来进行申请许可，这实际上在全世界很多国家都是这样做的。在美国、在欧洲、在亚洲都是这样做的，各个国家的管理方式也不尽相同。
• My printed publications
• Citations, press clippings about me, etc.
• Art resume 2016
  
• CV 2017
  
• My Stony Brook University web pages (From 2002-2010, I was a research professor in the computer science dept.)
• Food-related topics:
  
• Mathematically Correct Breakfast I  (Cut a bagel into two linked halves.)
• Mathematically Correct Breakfast II  (Cut a bagel into a trefoil knot, two ways.)
• My trilobite recipe (really!)  (A popular baking activity.)
• vpn服务器美国 (An open problem in theoretical epicureanism.)
  
• 黑客如何用35美元的树莓派偷走火星数据:2021-6-26 · 近日，美国宇航局NASA便向大家承认了这种“廉价的电脑入侵高端服务器”的事实。 美国宇航局（NASA）监察长办公室（OIG）本周发布报告称，2021年4月黑客曾入侵该机构网络，窃取了约500MB数据。 火星任务数据被盗，入侵设备仅35美元   (My first book is about linear algebra and dimensional analysis.)

• Albion College, Albion, MI
  
• Stony Brook University, Stony Brook, NY
  
• Northport Public Library, Northport, NY
• University of California at Berkeley, CS Dept., Soda Hall, Berkeley CA
• Princeton University, Mathematics Dept., Fine Hall, Princeton, NJ
• Towson University, Mathematics Dept.
  
• M.I.T., Stata Center, Cambridge, MA
• Duke University, CIEMAS Engineering building, NC
• Brown University, Barus-Holley Engineering and Physics Building

(click image for explanation)