A proposal:

Imagine two void spaces

Both spaces without windows: uniform illumination is achieved via inset overhead light sources 

One space is smaller, one space is larger - both connected by a 1.6m wide 'doorway' that is without door

Both spaces are without corners or seams - both with gradual, sweeping edges connecting floor/wall/ceiling

You first enter the larger space - through a 1.6m doorway (with door)

You are faced with an image of The White Cube

It is nailed, floor to ceiling, onto a wall

A person presents you with a handheld audio device with headphones, a braille handout or is able to sign BSL

The above lecture is cited as you are conscious of The White Cube image 

This image provides the appearance of non-neutral space, within the void space

The lecture concludes, you proceed through the 1.6m doorway into the smaller space 

It is here that you view the lumps.