[actionfromafar]

That's perhaps the heftiest clue that it might not be actually 1 million $1 bills. Looks unsafe to perch it like that.

[jjk166]

It's substantially more than 1 million $1 bills.

[actionfromafar]

So more than a metric tonne swiveling like that? Sounds dangerous.

[jjk166]

Not particularly. That whole cube could be supported by a 1/4" diameter steel pin. The actual support almost certainly has a double digit factor of safety.