Is there any way to visualise a set of inequalities when there are 4 variables at play?
Context: if we have inequalities involving two variables only, one can highlight the ensemble of points that satisfy the inequalities on a 2D plane. For example x+y<4. Similarly one can imagine for 3 variables in 3D. But if we have four variables with the following set of inequalities: $1<a<5$ and $1<b<5$ and $1<c<5$ and $1<d<5$ and $a\neq c.$ Is there a meaningful way of performing an embedding the solutions onto a 3D or 2D plane?
If visualisations are not possible, is there other ways Mathematica can help in giving more insight into the solutions of the above set?