The clock is listed as giving a slight boost to effectiveness within a room.


The effectiveness boost of a single clock is 6.7%.


Adding another clock to a room of which already has a clock will incur a boost of 10% effectiveness, a 3.3% increase. But, adding more clocks to the 2 already in the room will do nothing. Even at 4 clocks a room will still only have a bonus of 10%.

The bookshelf is listed as giving a boost to employee skill

The bookshelf gives a boost of 16.7% to the skills of employees.


Adding a second bookshelf will increase the bonus from 16.7% to 25%, an 8.3% increase. As is the same with the clock, adding more than 2 of the same items will not increase the bonus.

Now, none of this matters
A room of 24 meters cubed with one bookshelf will have a bonus of 16.7%, but a room of 12 meters squared will have the full 25% bonus. i.e., a smaller room incurs a larger bonus and a larger room incurs a smaller bonus.

Something something two of everything. Good day everyone.