The author thanks:
SketchUp developers and the various plugin developers
… for the fabulous 3D software - now from Trimble
Takuji Hatakawa
… for the export function for SketchUp models into the html5/WebGL format
Olaf Schreiber Softwareentwicklung und Consulting
… for the friendship service of website development
Prof. em. Dr. Dierck-E. Liebscher
… for his support in my studies of mathematics and cosmology
Wikipedians
… for the incredible number of things I have known and learned
Mathematicians
… who have created wonderful things
and hundreds more
… who have shared their knowledge with me