Hi there!

I'd bet on at least couch size !!!

Have a great day and stay safe.

The ruby beholder is indeed an awesome tool. Now that you bring it up I have no clue where mine is either. 

If your Ruby Beholder developed legs and ran away you could go to Office Depot or Staples and purchase a red plastic "report folder" which will accomplish the same thing.

I have a pair of "Sew Red" glasses (with red lenses) but apparently they are no longer on the market. Here's a silly posting on the Missouri Star Company's website saying they don't have them ..

https://www.missouriquiltco.com/shop/outofstock/16657/sew-red-glasses/-/sew-red-glasses

I seem to remember reading somewhere that you could take a B&W photo of something to see the color values better.  (Or, just take the photo and then do whatever you have to do in your photo program to show B&W only.)  I will admit, I have never tried it, but it might work.    

Of course, on Amazon they have everything.  You could find a pair of red-lens glasses on this page.  There are a few pair under $10.

https://www.amazon.com/s?k=glasses+red+lens&####

Thanks for finding those, Jonna.

Those would be harder to lose, ladies.  LOL

Pirate (PIRATE_SR) said:

Well, *this* Hollow Cube was a poor choice in fabrics. 

The illusion still works!  

Eh ... D-  and that's a gift.

we got pieces of red plastic with a key chain on it at Retreat one year...

(can I find mine?? dunno...but I have an idea of where it would be in my sewing room)

just trying a new way to post a photo. Not sure why it went sideways on me.