Final answer:
The participle in this sentence is 'receding', which functions as an adjective.
Step-by-step explanation:
The participle in this sentence is receding. A participle is a verb form that functions as an adjective. In this sentence, 'receding' describes the noun 'lights'. It is derived from the verb 'recede' but is used to modify a noun or pronoun.
Learn more about Participles in English Grammar