Assertion: glass sponge | /r/MadeOf | glass
Facets:
value: quite literally
type: DEGREE
Source sentences:
text: Are glass sponges made of glass?
text: This is where is gets the name "glass sponge" because quite literally it is made of glass, making it the most exquisite example of the class Hexactinellida, but also as precarious and as brittle as glass can be.