the second kind of noun is a cell: an ordered pair, in brackets.
:* makes a tuple of many elements, nesting to the right.
:*
:*(1 2 3) is [1 2 3].
:*(1 2 3)
[1 2 3]
irregular forms:
[a b c d] is :*(a b c d)
[a b c d]
:*(a b c d)