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It looks like she has a lap easel leaning on her knees. Here's an article about her doing this: https://at3centerblog.com/2019/07/08/frida-kahlo-painted-using-assistive-technology-and-so-can-you/
To lay really flat you'd want something that held the canvas more vertically. I'm sure there would be a way to rig it like an tablet stand or such like this: https://www.vio-zon.com/col.jsp?id=130 or for the big bucks, my dream type setup: https://www.computerdesksdepot.com/products/dw630w-63-hospital-lcd-tv-monitor-arm-over-the-bed-arm-wall-mount
Here's a lap easel - I'm not sure it goes vertical enough but you can look further: https://www.amazon.com/NNEWVANTE-Drafting-Adjustable-Drawing-Foldable/dp/B07C75SNYH/ref=sr_1_9?dchild=1&keywords=lap+easel&qid=1623547043&sr=8-9
Another pic, with cat tax.
This set-up has really helped relieve my back pain from hunching over a table, and there are often posts here asking about puzzling set-ups, so I hope it will help someone else out there!
Here are the details:
The lap-table-stand-thing is from Amazon, and I love it (link). It folds down flat if I want to work from a table, and it unfolds to fit over my lap if I want to work from the couch. It has 5 adjustable angles (including flat for storage) and the height is also adjustable. The only issue is that using too high of an angle can cause the puzzle to collapse under its own weight or slide right off the board… (Also, the same company makes adjustable tv tray tables if you don't want to work from your lap.)
For puzzling boards, I use cork boards from U Brands. I specifically prefer them because the backing is fiberboard instead of cheap flimsy cardboard. I really like using boards rather than assembling directly on a table because I can prop them up as needed, they can be put away (from my cats!) easily, and I can work on multiple puzzles at once. The cork gives enough grip to hold the pieces in place, but is still smooth enough to slide pieces around. I’ve tried fabric-covered puzzle boards and I absolutely HATED them because I couldn’t slide pieces around. The smaller board pictured is 23x17 and will hold a 500 piece puzzle with extra space to work. The larger one is 23x35 and will hold a 1000 piece puzzle with extra space as well. Target has similar U Brands boards for dirt cheap (<$9 for the 23x17, <$12 for the 23x35).
The clip lamp is a rechargeable (USB) LED lamp (no batteries or cables needed). The LEDs don’t flicker, and they are fully adjustable for different light levels.
Puzzles pictured: 1. 300 pieces, Cardinal, from dollar store. 2. 1000 pieces, Ravensburger, “Maritime Souvenirs”.
Whew! That was longer than I intended. If you’ve read all the way through, thanks for coming to my puzzling TED talk :P