I assist people throughout the day yet can be the cause of much distress.
I am generally quiet yet I do sometimes cause alarm.
I come in a variety of colours but black or white are the favourites.
I am ordinarily circular yet my shape changes according to interior fashion.
I hang around in the same place all day yet contain a number of moving parts.
I take my vigour from an external source but ration it out very slowly.
I have in recent years undergone a change in the way my insides function.
I am probably the most looked at yet least admired entity in the area.
I have a fulcrum harbouring three yet go up to four times that.
I am numbered up to over ten yet have five times that many ticks.
WHAT AM I?
Last week’s Fustigator: Currency