Everyone needs a brain in a jar. Lets take the vegetarian route and go for a 3D printed one.
This is a one off model, the brain is from a scan by benkrasnow and is available at www.thingiverse.com/thing:2903048. Its his own scan so technically its a (copy of) a living brain in a jar….
The jar will be sent unfilled as it is not watertight and most countries have restrictions on shipping fluids. Simply use food colouring or paint pigments in water to achieve a fluid look that you like. The effect seen here is simply water and one drip of vallejo yellow airbrush paint.