Do any concave slopes or curves exist? Any brand

Question

Do you know if anyone has ever made any concave slope pieces? Looking for multiple lengths (2/3/4/5/6 stud lengths). Basically the opposite of this style: 
I would also be looking for the same concave shapes, which would go underneath, similar to this: 
The first example is a graduated curve, the bottom seems to be more of a constant curve. I would prefer graduated if possible, but in the concave direction, with the shallower slope at the bottom, steepening towards the top.
If not, does anyone know anybody that makes custom shapes or pieces?

Alex · Answer

There's also these large pieces used in some Sports sets.
Sports Arena Section / Skateboard Ramp:

Sports Arena Section / Skateboard Ramp Corner

jk - Reinstate Monica · Answer

For the concave shapes that go underneath, there are a lot of bridges and archs from LEGO.

Craig · Answer

Part 18653 Brick, Arch 1 x 3 x 2 Inverted

Brick, Arch 1 x 5 x 4 Inverted

And a few other inverted arches

Do any concave slopes or curves exist? Any brand

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