re: ILLUSION

Thanks for the comments
Yes the first look at this is the illusion and further looks reveal the real thing and that I find the fun part .
Madts
It’s not a CD but a disk from a hard drive but a cd would maybe work also especially with that title .
Here is a link that is worth reading
http://www.instructables.com/answers/What-are-hard-drive-platters-made-of/