A luminous coastal dusk rendered in oil on cardboard, this intimate 1902 panel by Maurice Denis distills the Nabi master's gift for transforming observed nature into near-symbolic color harmony. Measuring just 18 by 29 centimeters, the work achieves a compression of atmosphere that larger canvases rarely manage, with the evening light along the shoreline dissolving form into layered tones of violet, amber, and deep marine blue. Denis painted such studies with the directness of a trained eye and the restraint of a theorist who famously insisted that a painting is, before all else, a flat surface covered in colors assembled in a certain order. Every brushstroke here reflects that discipline. The work is signed by the artist and accompanied by a certificate of authenticity issued by Claire Denis on April 13, 2019, lending full scholarly confidence to the attribution. Cardboard as a support was a deliberate choice among the Nabis for outdoor studies, allowing swift, responsive mark-making that preserves the spontaneity of the motif without the weight of canvas preparation. This example sits comfortably within Denis's sustained engagement with the Breton coast and the spiritual quietude he associated with sea and sky at the close of day. It represents a high point of Post-Impressionist sensibility, where personal devotion and pictorial intelligence meet in a format suited to refined private collection. For collectors drawn to works of concentrated poetic force, this panel offers a rare opportunity to acquire an authenticated, intimate-scale Denis with genuine exhibition presence. Currently offered through Helene Bailly Marcilhac, the piece is presented unframed, leaving room for a considered presentation that honors the work's delicate tonal range.