Part of Marcus Smart is made of glass. Lessons from his past life.

 No, The Wolverine doesn't have a glass eye, but rather, there are still fragments of glass embedded in his right hand from when he punched a picture frame in 2018 ( per CelticsBlog's Keith P. Smith):

 Following the game (Celtics-Pelicans), Marcus Smart was spotted rubbing and flexing his right hand. When asked if his hand was sore, Smart revealed he still has glass in his hand from punching a picture frame in 2018. Smart also said at times he has trouble finding feeling in the hand because of the glass. That makes his 12-assist night even that much more remarkable.

It appears the picture-punching days are over and we see Marcus orchestrating the offense with precision and control. He seems to be doing that in his personal life also. 

Smart's late mom, Camellia, used to tell him, "Calm your ass down". Looks like he has done that. The following from one of my previous articles:

But Marcus said it best recently. He views basketball as the calm center of a violent storm - his safe refuge. Nothing can hurt him there. The world can be going nuts - which it is, by the way - but Smart has his haven - and that is within one of the finest sports organizations in the world.

Not a true point guard, huh? It's not just the number of assists (12) against the Pelicans. Those successful passes were done "Smartly" - with precision, at the right time to the right teammate - and most of all, under control. His mom would be proud.