Hexclock

The Hexclock displays the current time hh:mm:ss as colour #hhmmss.

The time is typically given as hh:mm:ss. Colours in RGB are given as #rrggbb. So in both cases we have a triplet of two digits. Let us combine these into colours specified by the time: #rrggbb = #hhmmss. That is what Hexclock does: It takes the current time and takes red for the hours, green for the minutes and blue for the seconds. So we have a "coloured representation" of the current time. That's it!