After explaining what had happened to Dustin, Ty convinced his brother to show him around the new house; so that Ty would be familiar with the house, Dustin agreed. To do so, the two boys unfused so that Dustin could lead the way. Dustin turned himself into a centaur with a horse head, and Ty turned himself into an anthropomorphic dragon. Neither of them had clothes now, but there was no real need for clothes in these forms.
Dustin led Ty back to the central staircase, where they rode one to a door that looked like some etching from a work of art. But it was real, and the door led to a space full of staircases and doors that were all connected and oriented in different ways. It looked exactly like a famous work by the Dutch artist M.C. Escher. Ty followed Dustin up a nearby set of stairs to a dining area, down a small hallway to another flight of stairs, down towards another door, and so on. Ty was amazed at what he saw, and couldn't help wondering what else could be in the house.
Dustin led Ty out of the Escher room into a hall of mirrors. He explained that touching a mirror allows the person to change into whatever form they themselves as in the mirror. This was demonstrated when Dustin showed Ty one of the mirrors: instead of a dragon and horse-centaur, Ty saw himself as a humanoid creature with two heads and four arms, and Dustin as a humanoid dog with four arms and a pair of shorts. After the two touched the mirror, their forms changed--they became what they saw in the mirror, and their reflections became the dragon and horse-centaur.
Down the hall was their sister's room, and she was FaceTiming with her boyfriend, who was currently some kind of dragon thing with his usual mullet. Wanting privacy, their sister asked her brothers to leave, which they did by running down the spiral stairs next to her door. They ended up in a library through a bookcase, and went through another to find an indoor fountain area, filled with gorgeous flowerbeds. Past the fountain was an art gallery filled with copies of many historic paintings and sculptures, and Ty admired both art and history--a rare combination. Their parent's room was behind two tall paintings that also functioned as a double door--the paintings, both by Holbein, depicted Henry VIII and his third wife, Jane Seymour.
Ty's room was at the end of the corridor, just as he remembered it. Even the view from the window was the same. Out of the room and through another door, the boys wound up in a domed atrium, with a staircase down the round room. Once downstairs, they found themselves...back in the front hall. Dustin explained that he was welcome to explore the house further if he wanted, then left for his own room. Ty then changed back into his human self, adding another head and widening his torso for it, as well as modifying his now-returned clothes to fit his new body.