Poinciana groove — the Ahmad Jamal Trio's 1958 hit (At the Pershing), built on Vernel Fournier's drum part: a stick keeps even eighths on the hi-hat while a mallet in the other hand plays a low-tom figure — 1, the and of 2, 4 — that comes from New Orleans street drumming as much as from Latin music. It is a straight-eighth feel, not swing.
Israel Crosby's bass answers with a two-bar ostinato (root, fifth, third), and the piano leaves the downbeat to the left hand and places light, high chords on the and of 2 and on 4 — Jamal's famous space.
Listen for the tom figure as the melody of the groove; the tresillo inside it (1, and-of-2, 4) is what gives the tune its rolling, two-beat lilt. Practice: play the tom figure with your left hand on your thigh and eighths with your right, then sing the bass line over it. The chord vamp here is a stand-in, not the tune's changes.