The machine
There is no box. What runs when you press RUN is an array of 2ⁿ complex numbers — one amplitude per basis state — and a gate is a single strided multiply over that array. At twenty qubits the array is eight million entries and the tab stops being interactive; at thirty it would not fit in this machine's memory at all.
So the object on the left is a render, and it is the most honest picture of this computer anyone can make. What the site is for is the part you can actually check: paste a circuit and read the state it prepares, rather than take anyone's word for it.
Verify a circuit