Since he first posted This, I have wanted to make it. Thanks to @ppipa1 for the file, it worked great!
The frosted acrylic I had has a different texture to it so the colors didn’t come out as nice as his.
A Christmas gift for my Metallurgy & materials engineer Son. It is a puzzle, but I wanted to make it suitable for display in the “classroom” of his home where my grandchildren are homeschooled, so it is covered with another sheet of medium acrylic held on by magnets so the puzzle pieces don’t fall out.
When I took College Biology there were only two families, and they had just decided that Continental Drift was really a thing And every time I see a mirror there is this horrified crazy old man staring back at me. I think the mirrors are all haunted.
The credit for the puzzle goes to @ppipa1, all I did was make the magnetic cover… paint the black… weed both sides of all of the pieces… color them, rebuild the puzzle repeatedly - yeah, there’s a piece of me in it.
I see great work on the forum periodically and this is great! @geek2nurse is getting G’ma of the year for her work. I think this puts you in the lead for G’pa of the year!
Yes, standard Sharpie. I didn’t have enough colors, but the blue is the same color. A second coat gave me what I needed. Same with the green. Thanks everyone!
I wanted to make a removable cover but was stumped on how. I was stuck on other mechanical fasteners for some reason. Almost a day passed before it dawned on me - magnets!
I couldn’t believe how simple the resolution was, or how long it took for me to come up with it!
And every time I see a mirror there is this horrified crazy old man staring back at me. I think the mirrors are all haunted. 
