Part of the reason why bottles should really have their necks to one side instead of in the centre.

Give air a pathway to avoid glugging

The basic idea goes that you have to satisfy those at the bottom before the top: if you’re freezing cold and hungry, you’re not giving much thought to the joy mastering new skills. Not terribly robust. But interesting and somewhat clarifying.

See updated sketchplanation of Maslow's hierarchy of needs.

Maslow’s Hierarchy of needs

Maslow’s is interesting, but not terribly helpful if you want to use it for something. This one however, I still find a very useful framework when designing (read about it in the DMI paper System Logics). Your sweet spots for the exciting innovations are the context and activity level needs. 

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Patnaik’s Hierarchy of Needs