There are other forest ferns with golden, translucent scales, but their leaves are very different from those of Christmas fern – usually much lacier because each frond is divided into leaflets, which are further divided into separate leafules.
One of the most important color discriminations involved in the operation of a submarine is that of reading the Christmas tree, a panel of 30 to 60 small jewel-shaped lights, used to indicate whether hull openings, such as hatches and vents, are sealed or not.
Christmas tree,
The god, vindictive, doom'd them never more / (Ah, men unbless'd!) to touch that natal shore.
Thinking of x∈_AB as a generalized element, for any f:B→C, we may write f(x) for the composite f∘x. In this notation the first domain–codomain axiom reads as follows: for any x∈_AB and f:B→C there is a well-defined f(x)∈_AC; that is, at each stage A, f takes A-elements of B to A-elements of C.
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