Let's draw wall square clock.
We draw a square, we halve it very wafer-thin lines.
We measure identical distance from the parties and we build one more square in it.
Divide each half of a small square into a half.
At identical distance from edges we draw circles and we start writing figures.
We draw the dial and arrows. The arrow which shows hours, is slightly less and more thickly than an arrow which shows minutes.
Erase auxiliary straight lines and still draw a second hand. Drawing of hours is ready.