  We construct a deformation of any $(0+1)$-dimensional theory of $N$ bosons
with $SO(N)$ symmetry which is driven by a function of conserved quantities
that resembles the root-$T \overline{T}$ operator of $2d$ quantum field
theories. In the special case of $N=2$ bosons and a harmonic oscillator
potential, the solution to the flow equation is the ModMax oscillator of
arXiv:2209.06296. We argue that the deforming operator is related, in a
particular special regime, to the dimensional reduction of the $2d$ root-$T
\overline{T}$ operator on a spatial circle. It follows that the ModMax
oscillator is a dimensional reduction of the $4d$ ModMax theory to quantum
mechanics, justifying the name. We then show how to construct a manifestly
supersymmetric extension of this root-$T \overline{T}$-like operator for any
$(0+1)$-dimensional theory with $SO(N)$ symmetry and $\mathcal{N}=2$
supersymmetry by defining a flow equation directly in superspace.
