This vase is built by using multiple rings of multiplex (plywood) boards glued on top of each other and then turned using a lathe.

Step 1: What You Need

Some scrap multiplex boards which must be size of the maximum radius of your vase.
Any saw that can make round cuts (bandsaw, jigsaw or even a scroll saw).
Wood glue.
A lathe (or a sander, but this will take very long!).
compass (for drawing circles)
Paper and pencil:-)

Step 2: Design Phase

The first step, is to make your (approximate) design. I sketched it up on a piece of quad ruled paper. I scaled it so that each two squares (=10mm) corresponds to the thickness of my boards (19mm in my case, but it doesnt really matter).
After sketching it up rouhly i decided for a minimal wall thickness (~10mm in my case) and drew the lines accordingly. Now I basically got a cross-section of the vase.

From this cross-section you can easily meassure the diameters/radiuses of all the layers.

Draw the the circles (or half circles) onto the board using a large compass (or a string + pencil, if you don't have one).
As I had only long and narrow boards i cut out half-circles and glued those together. If you are using a jigsaw and you have got wider boards you can of course cut out the whole circles.

The circles don't have to be ultra precise, bettter make them a little bit too big than too small. You can remove material quite easily on the lathe

Step 3: Gluing and Turning

To glue everything up, stack the rings on top of each other and be careful to align them properly. When you are happy with the form and alignment, draw circles outlines of the rings onto the rings below, so you can easily restack them and apply glue.
Apply glue, put the rings back onto each other and clamp everything together with large clamps (or put heavy weights on top of the vase). You should add a larger board on top of the vase, so you can clamp it properly.

IMPORTANT: When you are using glued together half rings, don't align the glue points on top of each other! you might have a weak spot during turning and the whole thing can fall (or better "fly") apart!

After gluing all of the pieces together, put it in the lathe.
I added another small baseplate to the bottom, so i could attach it to my chuck. I also glued a baseplate ON TOP  the vase to stabilize at further with the tailstock/spindle (my circles were not cut perfectly, therefore it was were imbalanced). 

I first roughed it down to be really round and to get rid of the steps between the layers using a roughing gouge, then I used a fingernail gouge to clean everything up.

Then I turned off the top baseplate (at the tailstock), so that I could turn the inside on the top part (only as far, as you can easily see from the top) 
I didn’t turn it on the inside because you barely can see inside the vase and i lack the proper tools (and skills...).
After that i sanded it with fine grid sandpaper (up to 400) and parted it off.

Unfortuntately I don't have any pics of this steps. But there're a lot of videos on youtube on turning hollow forms, check those out.

Your gouges shold be really sharp for cutting plywood (ok, this holds in general for wood turning).

If you don't have a lathe you can also sand it down using a belt sander. I've done this in another project, but it takes really a lot of time (see here)

Step 4: Finish

For finish I oiled it with danish oil to emphasize the look of the different layers of the multiplex boards.

My mom is using mostly dry flowers, so I didn’t seal the inside. I think you could use some water proof lacquer on the inside by simply pouring it in and turning the vase, so that it spreads equally.
oh this is so beautiful!
Very Nice.
That is really pretty, nicely done!

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