in 

                            Jean Metzinger: The Blue Bird                                                                                                                                                        Albert Gleizes:  Woman with animals

... shadow and light ... 

four-dimensional 

I 

 love this one  

! simplistic yet ingenious ! 

the
: bottom in this my photo : 

reflection and refraction 

of
light

... likewise to every flat object ...

there are two dimensions in the photo  

... however ...

at second glance there are "gradually" more dimensions to be        

discovered  -  although   

  this happens only in your brain 

of
course

! the basics of every traditional painting - in general - and of illusion visual arts in particular !  

... no doubt about the second and a third dimension ... although this even can be tricky fairly tricky ...          

as we
will see
further below

↓ ↓ ↓

... shadow and light three-dimensional ...