Inverted Bar Charts
If you haven't already read Andy Cotgreave's blog about how the title, colour and orientation of charts can make a tremendous impact in controlling the message of a dashboard the head over there now.
The impact of subtle visual tweaks
I think we all know how easy Tableau makes it to change titles and colour schemes, but you may not realise how easy it is to invert the bar chart.
Once your bar chart has been created simply right-click on the axis and select "Edit Axis". There's a Scale Reversal button hidden sown in the bottom left of the dialogue box. Tick it then hit OK. Et Viola - Your chart is inverted.