Function _ The way you use your coffee table is a key factor, if yours tends to double as a dining table for yourself or children, look for an easy to clean surface such as glass or poly, if you are intending on housing your DVD collection in your coffee table you will need to look for something with storage. If you have young children who may be crawling, or climbing on furniture, you may like to consider something with round edges, which does not necessarily limit you to round designs; many rectangle tables will have a softer curved edge.
Ideally you want a clock and table that compliment each other to the degree that they both add something to the appearance of each other. A table that looks nice can bring the best out of a coffee table clock, and the same goes for a nice looking clock. Clocks which have a chime mechanism o them are a nice feature to have on a coffee table clock, these add a certain amount of atmosphere and dignity to a clock and can give a clock the appearance of being a more expensive time piece than it is. The shape of the coffee table should play a big part in the type of clock that you choose to go for. Coffee tables come in shapes and sizes and it is important that you get a clock that best suits the shape of the table as well as the material that the table is made of. A small domed shaped clock looks rather nice when placed as a centre piece on a medium sized round coffee table. It's important to get the proportion of the clock right against that of the table. A clock that is too large for a coffee table can just give the impression of something that has been placed there waiting to be moved on to somewhere different. It is not that difficult to find a clock to suit your coffee table, clocks are available in many different styles and price brackets.