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You look through the glass at the blank paper on the desk. So, you are looking at both the blank paper on the desk and a superimposed reflection of the iPhone/iPad screen in the glass, both of which are in your field of vision.
There are some limitations--which probably explains the negative reviews. It's difficult to see your pen or paintbrush because it is blocked by the reflected image from the iPhone/iPad.
However, I'm not aware of anything that does this at this price point. The art projectors I've found online cost a fortune and, I imagine, would have similar limitations.
This is pretty handy for tracing images from your screen to paper - I’m really enjoying it. You just have to remember to brighten the screen, and you can zoom in on an image to get exactly the size you want to trace. It doesn’t need the app.
The product itself seems to be good. However, the directoons are in chinese. Also the website is useless. All the language is in chineseand unsure how to use it. NOT user friendly App. There should be an english verision. The app would also nit diwnload onto my phone.
This is a very simple but effective device. It works great with iPad or iPhone. You can quickly get an accurately proportioned sketch laid out. I’m so excited and definitely recommend! Thinking of gifting to my kids who love to draw. Worth the purchase!