With the end of the Xserves, Apple practically abandoned the corporate server market. Macs Pro are clunky towers and mini Macs are for small businesses and very specific cases, much like a puzzle.
Aiming for a future update on Macs Pro, the reader Jos Artur C. conceived a mockup which more or less maintain their current look, but change the position of the upper wings so that the machines can be stacked.
Check in detail:
And a visualization of the thing in practice:
And what did you think?