How do you know what objects create lift, for example does a brick create lift?
Edit: I know someone might then ask what if you have a brick shaped like aerofoil and to that i answer why aren't planes made of brick then...?
The lift force is simply defined as perpendicular to the freestream velocity vector. It is a component of the resultant force generated from the pressure and shear distribution about an object.
How lift is generated in the first place is more complicated by you should read up about the starting vortex which, according to a few articles I've read, has been experimentally verified. Mathematically, you can express lift through the circulation about an aerofoil, but this is a mathematical concept, circulation doesn't really have any physical definition (according to what I know) but using Stokes Theorem, you can relate it to vorticity and it represents the flux of vorticity through a surface. Vorticity can then be thought of as the tendency for a local fluid element to rotate.