Rubik's family cubes of all sizes Rubik's family cubes of all sizes The original Rubik's cube was a mechanical 3×3×3 cube puzzle invented in 1974 by the Hungarian sculptor and professor of architecture Ernő Rubik. Extensions of the Rubik's cube have been around for a long time and come in both hardware and software forms. The major extension have been the availability of cubes of larger size and the availability of the more complex cubes with marked centres. The properties of Rubik’s family cubes of any size together with some special attention to software cubes is the main focus of this article. Many properties are mathematical
Lucid 3-D Lucid 3-D Lucid 3-D was a spreadsheet package that began in the MS-DOS era; Windows support came later. Sam Redman and Michael Stanford incorporated as PCSG corporation (Portable Computer Support Group). Their Lucid 3-D spreadsheet was marketed by DAC. Lucid 3-D was considered noteworthy at the time for being "the only major memory-resident spreadsheet available for the PC." The selling point of the product was being "three dimensional. "Any cell" of the spreadsheet "can contain a complete other spreadsheet that you can access with a single key"stroke." Another technical feature was what their ads called "not only minimal recalc, but