Earlier quoted context omitted.
It occurs to me that the fewer lexical types a language has, the less possible it is to highlight it in a pleasant way. Lisps and Forths (and most assembly languages) must look unpleasantly spare; and an encoding like Urbit's Nock would be literally monochrome.
Unpleasantly spare? http://take.ms/k83XH
Are you using Reagent?