Because properties are intermingled, they cannot be measured exactly at the same time. Max Planck's quantum hypothesis in the year 1900 marks the beginning of quantum mechanics. The relativity of motion causes the edge of space and time to become elastic. Distance and duration depend on the state of motion of the observer. Several properties of the object depend on the motion with respect to the observer.
Perception is the creative process.
In quantum mechanics the measuring apparatus is an invisible and undefined thing. That's what we should be looking for. If you already visited some pages of Tony Smith, you won't be surprised that I'm starting with my favourite 24-cell. This is a fourdimensional figure with remarkable symmetry properties. These are the socalled Platonic polyhedra.