Chair Modeling - Spline Technique by Florence Design Academy

Now you should have this result.

Create a sphere and squeeze (scale) it in only one axis to make it flat.

Create a flat sphere in each marked point.

Create a cylinder in each marked point.

Create an arc (Spline), enable the renderer and viewport like in this image.

Copy the arc like in the picture

Here you can see the final result.
I hope you have enjoyed this tutorial.