The digital twin concept is defined as a trio of physical counterparts, vir- tual counterparts, and their connections. A digital twin, which is used in many industries, can be a simultaneous reflection of a building and its design scenarios, digital versus physical or physical versus digital, in the architectural design realm. Specifically, our focus is on the built envi- ronment, where hybrid prototypes can use several sensors, actuators, and processors to simultaneously collect and react to data by applying digi- tal twin technology while still in the design process. Hybrid prototypes extend physical models as we know them today with digital models sup- ported by digital twin technology. The foetal digital twin is at the start of the concept design and can be in the form mainly of simulations or a physical scale model combined with some sensors. The child digital twin can be a door or window model, facade prototype, shading system mock-up, or wall prefabrication fitted with sensor technology. Here, we hypothesise that foetal and child digital twins may be appropriate stand- ins for adult digital twins through the design process. Therefore, we try to determine how we can have better foetal, child, and adult physical and digital twins. To accomplish this, we provide an architectural design cat- alogue that includes sensors during prototyping to guide designers. Sen- sor network establishment is one of the first tasks that can be performed for a digital twin. The sensed data from the physical prototype will be used in a digital twin to actuate and monitor the status, and the digi- tal prototype will be used for the simulation, optimization, and predic- tion of future status. Eventually, data combination will be achieved with the help of Building Information Modelling and the Internet of Things. To guide the design process efficiently, it is important to decide where the sensors will be because, after the final design and operation, things will be handed over to a facility manager.
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