Why-Not is a Belgian producer of masked castle galas, running for fifteen years and now relaunching its evenings under the name The House of Senses. It hires a castle in Hainaut for each edition and holds no premises of its own.

It describes what it makes as a bewitching castle world of light, perfume, music, elegant encounters and sensual magic, and says The House of Senses is not a classic gala but a built experience in which aesthetics, emotion and refined sensuality come together. Guests are received by a character called the Baroness, and the castle's historic rooms — a bar, a reception hall, a ceremony room and a ballroom — are dressed to a theme, with an Art Room given over to projections and sound and a lounge opening later in the evening. VIP guests get a separate champagne lounge by the fire. Alongside the galas it runs other strands, among them an erotic Cluedo, a photo shoot and a castle weekend.

The exact address is not published: it tells guests only that the castle lies between Tournai and Mons, and sends the location with the invitation and a password. Tickets are sold through its own shop, with an optional hotel room and a couples' shuttle, and its next announced castle party is dated Saturday 20 March 2027. The site is published in Dutch, French and English.