Harry Phelan Gibb sits in the centre of the value range, lending the palette a sense of even, sustained light. Harry Phelan Gibb keeps warm and cool in parity, a balance that lends the work a perceptual shimmer. Muted throughout, the palette achieves its effects through value and temperature rather than chromatic force. #717E4F functions as the palette's exclamation mark: highest chroma, lowest percentage (1.2%). Value range is moderate at 32 units - enough contrast for legibility, not so much as to fragment the tonal unity. In the context of Harry Phelan Gibb's full range of palettes, group 5 represents one movement in an ongoing chromatic dialogue.