Invisi-Puzzle - Infuriating Transparent Jigsaw Puzzle

This cool new Invisi-Puzzle* is an infuriating jigsaw puzzle made up of 300 transparent pieces that are almost all the same shape, clearly double-sided, and there's no reference photo, but imagining a pane of glass may help you. Perfect for jigsaw puzzle lovers yearning for a super difficult challenge, bored people with a lot of time and who don't like seeing table clutter, and those with evil cats who like to knock pieces off the table, because now you might not even notice that they're missing.