What did george berkeley mean about such things as tables and chairs when he denied the existence of matter?

There are no unperceived tables and chairs.

Explanation:

When Irish philosopher George Berkeley developed a theory he called "immaterialism" (also known as "subjective idealism"), he explained that material objects such as tables and chairs do not exist but in our minds. In consequence, they cannot exist if we are not able to perceive them.

china unilaterally claims the entire south china sea as sovereign territory, then builds artificial islands to bolster its claim. it suddenly activates an air defense identification zone over the east china sea, and threatens to down any aircraft that does not report its position. it builds roads into indian territory, then redraws the maps to show that it is actually chinese territory. the people's republic under president xi jinping is quickly becoming the bully of asia.