He spent many nights up, and wandering the halls of the institute or finding something to idle his time. Sleep was never something that came quickly or easily for the man unless he was in desperate need for such. Like Jace, he too stared up at the ceiling for a great deal of time, though he had chosen to look at the stars as he used a bit of magic so that he could see through the roof and into the sky hoping it would bring his mind some sort of solace for the evening.
Grinning as he counted them at first, connected the constellations and even drew them out with his finger as he had done when he was a boy. Eventually this would have been enough to calm him into a peaceful sleep, but instead there was something that stirred. Not just within him, but someone in the house. He wouldn't have given it a second thought though the music had managed to slither into his ears and instantly his curiosity was met with action. Pulling himself from his bed and finding something as simple as a pair of pajama pants to slide on as he walked through the halls without a sound. It was beautiful.
The music hit in notes that carried a heavenly tune, something he actually missed about being among the Court at times. The music was always alluring, pleasant, and even euphoric at times. Still his feet padded along the wood floor until he came to the doorway of the main room where he noticed it was Jace Wayland who was playing. Of all men, it was this one and this had been something that Mark was unaware that he could do. A pleasant surprise as he stood there, masked in the shadows save for his feet. Though they were out of Jace's sights with the piano in front of him, would have given him up easily as Mark bore many mundane tattoos among his olive and lavender runes on his skin.
When Jace began to play again, after noticing he was there he smiled. He looked very much at war and peace at the same time with that instrument standing in such grande presence before him. Looking up to the ceiling of the dark room he would move his fingers lightly as to send up dozens of small golden flecks that would hang high in the air like lightening bugs, casting down a golden glow just to illuminate the room enough for each other to be seen and nothing more. Stepping in further he'd linger around the piano as he watched the other still, silent and enjoying the music.