3. The form of the top of the 'tree' in GD22 is (judging from the readings of Metoro) the significant part. Possibly the tent-like form has the same origin as the form of the Taranaki storehouse in this unique picture from New Zealand (ref. Starzecka):

The apex probably represents midsummer. Strange snake-like creatures crawl up at left, before midsummer. The king - he wears a crown - is looking up horrified:

The reason is insight about his own imminent death. Beyond his execution the skull, symbolizing an egg, is used for the procreation of next generation. Childish joy is pictured beyond the vacant space (you cannot see inside a womb):

The yearly cycle of the sun can be compared to the cycle of all life - birth, growth, waning and death.