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This is because the image is bistable, similar to the famous Rubin vase illusion

Black Brocade Off the Shoulder Formal Themed Ball Gown Condition: Brand New Color:Black Material: This dress made of High Quality Brocade,Lace,soft,smooth and comfortable to wear Sleeve Length:Half Sleeve Dresses Length:Floor-Length Neckline:Square Collar Decoration:Lace + Ruffles Applicable People:Adult Package Includes:Dress+Headwear Stunning Victorian-era ball gown featuring black brocade fabric with elegant white lace trim and gold accents, perfect for historical masquerade events

Leilani Platinum Teal Maxi Dress $99 Step into a world of luxury with the Leilani Platinum Teal Maxi Dress

Its cut to fall above the knee, and the neck is typically a scoop neck or boat neck