-------- Original Message -------- Subject: RE: Disco Ball Globe? Date: Mon, 12 Apr 2010 10:59:48 -0400 From: Grabach, Kenneth A. Mr. <[log in to unmask]> To: Maps, Air Photo, GIS Forum - Map Librarianship <[log in to unmask]> References: <[log in to unmask]> I suppose it would depend upon whether the image is reflected or projected on either wall. In the reflected version, I think whatever geometry it possesses, it would be a new form of map projection, a Reverse (geometry) projection. And in a cylindrical room, it would become a Reverse Cylindrical projection. Disco halls can take on a variety of shapes, including trapezoidal and others. And imagine if one were used inside a geodesic dome. My head begins to reel at the myriad possibilities. Good luck, Tinho! Ken Grabach <[log in to unmask]> Maps Librarian Phone: 513-529-1726 Miami University Libraries Oxford, Ohio 45056 USA -----Original Message----- From: Maps, Air Photo, GIS Forum - Map Librarianship [mailto:[log in to unmask]] On Behalf Of Angie Cope Sent: Monday, April 12, 2010 10:41 AM To: [log in to unmask] Subject: Re: Disco Ball Globe? -------- Original Message -------- Subject: RE: Disco Ball Globe? Date: Mon, 12 Apr 2010 15:37:25 +0100 From: Da Cruz, Tinho <[log in to unmask]> To: [log in to unmask] <[log in to unmask]> References: <[log in to unmask]> <[log in to unmask]> If one's disco ball is in a cuboidal room, what is the projection of the map reflected on the walls? What if one is in a cylindrical room*? I can't find disco ball in any Snyder index that I have (Geol Survey Bulletin 1532 or USGS Professional Paper 1453). There's a opening here for an educational disco ball. Who'll be first to get a disco ball and some glass paint? Do we also need a transparent disco ball with a source of light in its centre? I teach our students about projections with: an inflatable globe that has no colouring for the sea, a sheet of white paper, and an overhead projector. I shine the overhead projector through the globe and hold the sheet of paper against the other side of it. By holding the sheet of paper flat, in a 'tube', or in a cone one can demonstrate several different types of projection. I was very happy with this method, but now I want a disco ball. Best wishes Tinho *common with those of us working in ivory towers. ............................... Antonio da Cruz (Tinho) [log in to unmask] Map Curator, Department of Geography, Roxby Building University of Liverpool, LIVERPOOL L69 7ZT Telephone: 0151 794 2844 Fax: 0151 794 2866 See the British Archaeological Association web page http://www.britarch.ac.uk/baa ----- Forwarded Message ----- From: "Frank Stieber" <[log in to unmask]> To: "Air Photo & Geospatial Systems Forum Maps" <[log in to unmask]> Sent: Friday, April 9, 2010 5:22:01 PM GMT -06:00 US/Canada Central Subject: Disco Ball Globe? This seems like an appropriate Friday Question...Has anyone ever superimposed a Map of the World onto a Disco Ball? I Really want to know, because if they haven't it needs to be done! Happy Friday! Frank L. Stieber Associate Librarian, Substitute Salt Lake City Public Library [log in to unmask] 801-448-9301