Idea:

Let's make a little table for comparing the number of the internal markings of the rectangles in these two tablets:

 

Sunday

Monday

Tuesday

Wednes-day

Thursday

Friday

Saturday

H

2 3 3 2 3 3 3

P

5 5 7 6 6 4 3

What does all this mean? Before trying to answer that question we had better be sure that we are counting in the right way. A regular rectangle does not look like above (Monday) and therefore we perhaps should count Monday as 5 instead of 3. The sloping lines are five and not three. Revising the table we then will get:

 

Sunday

Monday

Tuesday

Wednes-day

Thursday

Friday

Saturday

H

3 5 3 3 3 5 3

P

5 5 7 6 6 4 3

This revision does not change anything in P, but H certainly looks more harmonious.