@John K Jordan , that mat board, is it the the same as used in picture framing, to build up mats around the image? Or is it foam core board? Thanks.
It's the same mat board as used in framing. I have a mat cutter and have done a lot of framing so I had plenty of mat board on hand.
It's flexible enough to bend and for small things, can make a great seamless background. I first used a piece of light grey as a backdrop for this little Cocobolo lidded box, clamped to a chair to make the curve, using soft natural light through the windows, (There are 5 windows in my piano room!)
The problem I had was the light changed a lot, sun moving, clouds and all. And was worthless at night!

So I built a 2x2x2' photo cube to better control the light. (Lighting is King!)
A PVC frame holds the mat board so it's flat on the bottom and curved up in the back, somewhat like on the chair.
I used pieces of PVC tubing and fittings to make the frame (press-fit so it can come apart easily).
The thing usually stays on my table saw, but can be taken down or put up in a couple of minutes.
I used safety pins to make folds on the edges of the white cloth to allow the PVC tubes to slide in and hold the cloth sides in position.
The two photo CFL lights on adjustable stands let soft light through the cloth sides. The small LED light on a flexible shaft, sometimes direct, sometimes bounced, can control highlights and shadows, depending on my mood at the moment. I often tape several layers of white tissue to the front of the small light or fasten a photo flash soft box (from Amazon):
Note that if using multiple lights, it really helps if they are all the same color temperature (for most photos.)
And before shooting a photo I turn off ALL the other lights in the room to prevent clashing battles between light colors!
I keep mat boards in a variety of shades, darker or lighter as the mood hits me. I mostly prefer shades of grey, some with subtle tints.
Nearly all of my turning photos I post here and elsewhere are made with this setup, usually with a Canon DSLR on a tripod. (Although cell phone cameras these days can be amazing - I use my Samsung in a pinch.)
Note that you can find photo boxes on Amazon and elsewhere, but none I found suited me.
If someone was interested enough to twist my arm I might be talked into giving more details (when I get time).
JKJ