The mural depicts several geometric shapes - a circle, a triangle, a rectangle, a pentagon and a nonagon and a series of engravings. In order, these are: Three ponies, a wave of water, four pyramids, the moon, five flowers and nine towers. It appears to be a riddle of some sort.
Strict Mode(In Strict Mode, the game will not
show you options that require a skill you do not have. In non-strict mode, these options will
be greyed out but you can still cheat and access them. You can switch modes at any time.)