- - Lens shape
- - study hole in cliff that curves inwards
- - Curves inward
- - hollow and curved
- - Dipping inwards
- - Prisoner in front of underground chamber looks depressed
- - there are 205 and one with a hollow in it
- - Depressed liberal leaves assembly
- - Like a bowl
- - Curving inwards
- - Curving inward
- - The vault of the sky
- - Like the inside of a sphere
- - Like the inside of a bowl
- - Like part of a circle
- - Like band shells
- - Curved in
- - Curved and hollow
- - Like some lenses
- - Inverted
- - Hollow
- - Having a surface which curves inwards
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