  We consider minimal type-A higher-spin (HS) gravity in four dimensions, at
tree level. We propose new diagrammatic rules for this theory, involving both
Fronsdal fields and Didenko-Vasiliev (DV) particles - linearized versions of HS
gravity's "BPS black hole". The vertices include a standard minimal coupling
between particle and gauge field, the Sleight-Taronna cubic vertex for HS
fields, and a recently introduced vertex coupling two HS fields to a DV
particle. We show how these ingredients can be combined to reproduce all
n-point functions of the theory's holographic dual - the free O(N) vector
model. Our diagrammatic rules interpolate between the usual ones of field
theory and those of string theory. Our construction can be viewed as a bulk
realization of HS algebra.
