The previous page shows four tables evolved by the system. The top two are asymmetrical, while the bottom two were defined to be symmetrical about the planes x=0 and z=0. All were evolved from an initial population of entirely random shapes.
The desired function of a table was defined by five reusable 'evaluation modules'. These specified that a good table should be a certain size, should have a low mass, have a flat upper surface at a certain height and with a certain area, be unfragmented (i.e., no part should be unconnected and 'float free' of the design), and should be capable of supporting a heavy object on the edges of its upper surface without toppling over.
The computer has used a number of sensible design concepts in the four tables shown (not that the computer knows it, of course). The top-left table has almost all of its mass at the bottom of the design, which increases the stability and makes it very unlikely to topple over. The top-right table is also extremely stable, but this design has a very wide base to prevent it from toppling over, rather than a low centre of mass. The bottom-left table uses four unusual-looking legs to provide a sturdy support, but it also has four weights underneath the table-top, which further increases the stability (by preventing the centre of mass from being displaced by heavy objects). Finally, the bottom-right table uses four more-or-less conventional legs to give this table stability.