Many years ago, people were thought to be crazy or sacrilegious if they believed the world was round. Going to school, I remember reading the world wasn't really round. It was more accurately described as oblate spheroid. In our time, I see people ridiculing the flat Earth theory. However, there are some scientists seriously postulating that the universe may actually be 2D, based on calculations studying black holes. Everything old is new again. You cannot totally write off a theory just because evidence may temporarily point in another direction. Further evidence may lead you to a new view of an old theory.

For more information on a 2D reality from a discussion by scientists at the World Science Festival:
https://www.youtube.com/watch?v=HnETCBOlzJs&t=2449s

For me, the Big Bang theory was always missing something. Creating the universe by contraction seems counterintuitive. It seemed a little less counterintuitive when coupled with a Kabbalistic view of creation. That view also postulated contraction of the universe, aka tzimtzum. Some of the noise people used to see on their analog TV screens was attributed to cosmic microwave background and is considered evidence that the Big Bang took place. The holographic theory presents a new theory that's still compatible with background noise observations, but also conceives the universe as being created as part of an expansive process rather than a contraction.

Some people like to point out that information in the bible can't be true by highlighting statements such as the creation of the world in 6 days and how that seems at odds with what scientists know about the universe and the creation of galaxies and worlds. According to modern physics theories, time near a black hole slows to a crawl for an observer. So, when someone speaks of something taking 6 days, one would need to know how those 6 days were being measured. Was it being observed on Earth or near a black hole? While both are 6 days to the observer, there's a huge difference to someone from a different vantage point as to how much time might pass in those six days.

Years ago, people viewed the Earth as the center of the universe. Just like the flat Earth theory, today, people feel that concept of the universe is very outdated. However, according to Einstein's theories, everything is relative. Motion is
relative to an observer. So, are people really being self-centered when they consider themselves as the center of the universe? I love the observation from Darwin in the show Seaquest that the center of the universe is within you.

When the movie Tron came out, it was ahead of its time and broke a lot of new ground. However, the comparison between programs and users to people in our world and a deity seemed far from reality, especially with the limitations of computers and programs at the time. Even with all the improvements in AI, I find it difficult to compare programs to the human mind. However, I found this video, from the
World Science Fair which expounds on the holographic universe theory and postulates the likelihood that we're living in a simulation, very fascinating:
https://www.youtube.com/watch?v=atMuFCpxnUQ

Many people today are very adamant about their beliefs and quote science or quote religion to back them up. Their theories seem very clear to them and other ideas seem preposterous or dated. However, if you look carefully, you might find that something that's dated or sounds unlikely, viewed in an alternate light and with an open mind, might actually make a lot of sense. It may even help provide a clearer view of your universe.

In the spirit of old things being new again, I'll end with a link to the wonderful book, Flatland, that came out back in 1884:
https://www.gutenberg.org/ebooks/97
FLOSS CAD software:

https://brlcad.org/
BRL-CAD is a constructive solid geometry (CSG) solid modeling computer-aided design (CAD) system

https://sourceforge.net/projects/librecad/
LibreCAD is a Free Open Source 2D CAD application for Windows, Apple and Linux

https://www.openscad.org/
OpenSCAD is the Programmers Solid 3D CAD Modeller
http://www.openscad.org/downloads.html
http://scorchworks.com/ScorchCAD/scorchcad.html
formats: DXF, STL, OFF

http://solvespace.com/download.pl
SOLVESPACE is a parametric 2D/3D CAD
formats: DXF, EPS, PDF, SVG, HPGL, STEP, STL, OBJ,

https://www.freecadweb.org/
FreeCAD is an Open Source parametric 3D CAD modeler

https://archimedescad.github.io/Archimedes/
Archimedes is Free and Open Source CAD Software

https://chocolatey.org/packages/jwcad
http://www.jwcad.net/
jw_cad is a popular 2D CAD from Japan.

https://github.com/mkeeter/antimony
Antimony is a CAD tool based on LISP.

https://github.com/colah/ImplicitCAD
ImplicitCAD is a CAD program written in Haskell which handles. CSG, bevels, and shells, 2D and 3D and gcode generation.

https://github.com/qcad/qcad
QCAD Community Edition is a 2D CAD for Windows, Linux and Mac.

https://github.com/leozide/leocad
LeoCAD is a CAD application for creating virtual LEGO models.

https://github.com/zecruel/CadZinho
CadZinho is a minimalist CAD program using the Nuklear GUI.


FLOSS 3D Printing Related Software:

http://www.salome-platform.org/downloads/current-version
SALOME is an Open Source Integration Platform for Numerical Analysis

http://www.k-3d.org/
K-3d is 3D Modeling and Animation software.

http://shapesmith.net/
ShapeSmith offers parametric, Open source, 3D modelling in a browser

http://slic3r.org/
Slic3r is an Open Source 3D printing toolbox.
G-code generator for 3D printers. Exports SVG slices.

http://dkobozev.github.io/tatlin/
Tatlin is a multi-platform Gcode and STL viewer for 3D printing

https://sourceforge.net/projects/meshlab/files/meshlab/MeshLab%20v1.3.3/
MeshLab is a mesh processing system for user assisted editing, cleaning, filtering and rendering of large unstructured 3D triangular meshes.

https://www.kicad-pcb.org/
KiCad is an Electronic Design Automation Suite

http://www.wings3d.com/
Wings 3D is an advanced subdivision modeler that is both powerful and easy to use.

https://wdune.ourproject.org/
White Dune is a VRML/X3D editor

http://www.gnuplot.info/
gnuplot is a 2D/3D plotter

http://www.artofillusion.org
Art of Illusion is a free, open source 3D modelling and rendering studio.

http://www.blender.org
Blender is a Free Open Source 3D creation suite.

https://www.libreoffice.org/download
LibreOffice Draw is a vector graphics editor.

http://bricksmith.sourceforge.net/
Bricksmith is a 3D virtual LEGO modeller.

https://github.com/OctoPrint/OctoPrint
OctoPrint provides a web interface for controlling 3D printers.

https://github.com/WEREMSOFT/stl-loader-for-raylib
stl-loader-for-raylib provides functionality to load, manipulate and render STL files on Raylib.


SVG software:

https://github.com/SVG-Edit/svgedit
svg-edit is a powerful SVG editor in a browser

https://github.com/cast-org/cwm-drawtool
CWM Draw Tool is an easy to use drawing tool based on svg-edit

https://wiki.gnome.org/Apps/Dia
Dia is a diagram creation program
formats: EPS, SVG, XFIG, WMF, PNG

https://inkscape.org/
Inkscape is a professional vector graphics editor


2D tools:

https://sourceforge.net/projects/ktoon.berlios/
KToon is a 2D animation toolkit

https://www.synfig.org/
Synfig is an Open Source 2D animation studio

http://www.pencil2d.org/
Pencil2D is a tool to make 2D hand-drawn animations

https://github.com/hlorus/CAD_Sketcher
CAD Sketcher is a constraint-based sketcher addon for Blender that allows creation of precise 2D shapes by defining a set of geometric constraints such as tangent, distance, angle, equal and more.


Other resources:

For more graphics related programs, see http://www.distasis.com/cpp/pbtc.htm#pb3

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