Fig. 243.
At this point you may work in any comic story of houses in a Western tornado, which, under a stress of weather are not stationary, but seem inclined to change their base and even to fly, etc. Fig. 243 shows how a man becomes a stationary object when the line AB divides him in the centre.
Motion.
But when you slant the AB lines they suggest motion (Figs. 224, 225, and 226).
Fig. 244.
Although the pyramid is the emblem of stability, when resting upon its base—with the AB line dividing it in the centre—if you take the same form and point the apex in any other direction it immediately suggests motion, as in Figs. 227, 228, and 229.
Fig. 245.