Une baleine mécanique fait irruption à travers un portail orné dans un mur de pierre

An extraordinarily creative 3D optical illusion mural inspired by Alphonse Mucha Art Nouveau style, painted on an elegant stone wall. The flat wall transforms into a deep 3D circular portal where a majestic mechanical ocean whale made of brass, turquoise glass, and glowing gilded gold leaf actively breaches out of the wall structure into the real space. Water splashes and glowing jellyfish extend past the wall borders with realistic cast shadows. Masterclass 3D perspective trick, rich golden filigree, museum-quality fine art, 8k resolution.