Mmm not sure about this one...I am a little disappointed but maybe it's just me.
* Fork in card: The very first idea that came to my mind is the solution at the end. A spectator will probably think the same thing and we don't want to lie right ?
I was expecting a more clever solution.
* Spider link: I didn't really care for it when I bought this. But it is nice, more on topological side. Difficult to handle because very thin.
I prefer topological object with card.
* The needle: Didn't care for it either. And I saw this in ooold book. Might be of interest for some.
* Checker board: This is the biggest disappointment. I was expecting some special fold like the braided bill. Not at all.
In the hand of spectator, he will quickly find out how it is done. Though this might be interesting to real topological purist as a puzzle/challenge.
But production is good with clear view/camera.
I prefer the topological card series and inside out banknotes. But thank you fairmagic sharing your knowledge about impossible/topological objects.
Still keeping an eye on your topological series.