Mask

1. A mask, comprising:

a plate-shaped body comprising openings; and

a modified portion comprising:

at least one first curved portion protruding from the plate-shaped body in a first direction and longitudinally extending in a second direction;

at least one second curved portion protruding from the plate-shaped body in the first direction and longitudinally extending in a third direction,

wherein the second direction and the third direction are substantially perpendicular to one another.

2. The mask of claim 1 , wherein:

the at least one first curved portion is one of a plurality of first curved portions;

the plurality of first curved portions are spaced apart from one another; and

the openings are positioned between respective pairs of the plurality of first curved portions.

3. The mask of claim 1 , wherein the at least one first curved portion is disposed in one or more limited areas of the plate-shaped body.

4. The mask of claim 3 , wherein the one or more limited areas correspond to a central area of the plate-shaped body.

5. The mask of claim 3 , wherein the one or more limited areas are disposed adjacent to one or more edges of the plate-shaped body.

6. The mask of claim 1 , wherein the shape of an axial cross-section of the first curved portion is a semicircle, a semioval, or a polygon.

7. The mask of claim 1 , wherein:

the at least one second curved portion is one of a plurality of second curved portions;

the plurality of second curved portions are spaced apart from one another; and

the openings are disposed between respective pairs of the plurality of second curved portions.

8. The mask of claim 1 , wherein the plurality of second curved portions are disposed in one or more limited areas of the plate-shaped body.

9. The mask of claim 8 , wherein the one or more limited areas correspond to a central area of the plate-shaped body.

10. The mask of claim 8 , wherein the one or more limited areas are disposed adjacent to one or more edges of the plate-shaped body.

11. The mask of claim 1 , wherein the shape of an axial cross-section of at least some of the plurality of second curved portions is a semicircle, a semioval, or a polygon.

12. The mask of any one of claims 1 , wherein the first direction extends upward or downward from the plate-shaped body.

13. The mask of claim 1 , wherein the modified portion comprises at least one of chromium, copper, nickel, magnesium, iron, tin, titanium, aluminum, and stainless steel.

14. The mask of claim 1 , wherein the modified portion is formed from a polymer.

15. The mask of claim 1 , wherein the modified portion is formed from the same material as or a different material from the plate-shaped body.

16. The mask of any one of claims 1 , wherein the modified portion is configured to stretch under tension of the plate-shaped body to:

enable a thickness of the plate-shaped body to be substantially maintained; and

enable at least one other dimension of the plate-shaped body to increase.

17. A mask, comprising:

a plate-shaped body comprising openings; and

a modified portion comprising:

protrusions protruding from a first surface of the plate-shaped body; and

depressions in a second surface of the plate-shaped body, the protrusions overlapping the depressions,

wherein the protrusions are disposed in a pattern, the pattern comprising at least one row and at least one column of alternating protrusions and openings.

18. The mask of claim 17 , wherein the protrusions are disposed in one or more limited areas of the plate-shaped body.

19. The mask of claim 18 , wherein the one or more limited areas correspond to a central area of the plate-shaped body.

20. The mask of claim 18 , wherein the one or more limited areas are disposed adjacent to one or more edges of the plate-shaped body.

21. The mask of claim 17 , wherein the shape of an axial cross-section of at least some of the protrusions is a hemisphere, a cone, a polygonal prism, or a polygonal pyramid.

22. The mask of claim 17 , wherein the at least one row and the at least one column are formed diagonally across the plate-shaped body.

23. A mask, comprising:

a plate-shaped body comprising openings; and

a modified portion comprising at least two curved portions protruding from the plate-shaped body, the at least two curved portions comprising:

at least one curved portion protruding in a first direction; and

at least one curved portion protruding in a second direction opposite the first direction,

wherein the at least two curved portions longitudinally extend in a third direction.